Here's my tip:

Either you're female or you should see a doctor.

In all seriousness, if these issues concern you, you really should consult a doctor. There's a multitude of things that could be wrong.

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Yes, I have some mood swings, related in my case to my physical health. Sometimes I get a bit intolerant, irritable and relatively easily angered, when I feel bad. It can be frustrating (for other people as well as for me) and quite difficult to deal with.

(I think the moderators here have noticed it, and probably a few members, too ).

There are many, many causes for these things and many ways to try to balance them out, depending on what causes them. I think the guys above are right that you should probably start from a doctor's opinion, though. It's the most important tip anyone can offer you, really. And good luck and good wishes.

I guess i have exaggerated a bit. Lol. My case is not too complicated like it may seem. The thing is i can't maintain a single mood all the time and that is annoying me

Maybe a doctor is an option but many of them are flat out lazy and just prescribe medication. There's a place for meds but there are often other ways to deal with stuff like this.

I think the key is in the statement I isolated above. You know that certain things don't matter but you are not able to change. How do you know you can't change? Have you tried?

I know someone that is very negative about most things. He finds fault with something when there is often plenty of good surrounding it. This is a choice. It's also a habit. When you behave in a certain way the majority of the time you tend to continue along those lines. This guy sometimes complains that there's nothing good to complain about. I'm not kidding.

This continual negativity makes him depressed so he went to the doctor and he ended up on mood altering drugs. I suggested that he consciously made an effort to change without the drugs. Awareness is the key.

I've personally been through something similar. Every time I noticed a particular behavior I stopped and told myself, "You're not going there." I've seen people put a rubber band around their wrist and when they began to get into the old habit they'd snap the rubber band, which makes them think of something else. It also associates a small bit of pain with the unwanted behavior. Some psychologists call this a "pattern interrupt." What it does is steer the individual away from the undesirable feelings/behavior.

When I was personally dealing with this I would recognize unwanted thoughts or feelings and immediately start humming Mozart. Other times I would sing to myself or out loud. I was deliberately replacing one habit with another one.

You've developed an unwanted habit. You're going to need to work on replacing that habit with different behavior. My friend put a moderate amount of effort into doing this and got off the meds. He's a lot more pleasant now, though, in my opinion there's room for more improvement. But that goes for everybody.

You also might consider meditation. These are just suggestions. Only you know whether you need to see a doctor or perhaps a therapist.

Since it has cost relationships, you should definitely consult with a doctor and take action.

Also, because you are aware that small things should not depress you or bother
you so much, you might want to work on the cognitive aspects as well. With a therapist
or good friends.

One of the housekeepers at the hotel I manage has a depression and anxiety disorder caused by a chemical imbalance. She takes medication and is getting counseling as well.
In her case, when she is off meds and everything gets to her, I'd say her thinking is VERY self centered and she does not mentally filter things out that most people would - so literally everything gets to her.

Finally, I would look at nutrition and sleep as well. It could be a matter of just eating better and getting enough rest. Or, it could be a reaction to wheat (pasta, bread) or dairy or something.

Yes, see a doctor should be first on the list.
He may recommend you see a psychologist to talk things out and that is a positive step. I speak from experience here.
I have lots of health issues and some days my mood is pretty bad. But I make notes and talk to my doctor or psychologist.

Meditation is another good way to stabilise your mood. Play relaxation music.

It's NOT wise to turn to food because that will only make things worse in the long run.

I really don't know your situation but start by making sure you do the following suggestions and if the problem persists then you should maybe see a doctor.

Eat right. Get enough vitamins and minerals and everything else your body needs. You can indulge in fast food once in a while just make sure your body is getting everything else. If your in a hurry and can't always make it to the grocery for fruits and veggies take a multi vitamin.

Excersise
The first part of having a healthy mind is having a healthy body. Make sure you have at least a bit of exercise. Small changes in your routine can work wonders. Walk to work, park further away from the store and walk to it, take the stairs, squeeze your butt while sitting Just add a few daily exercise's and you will already see a difference.

Sleep Are you getting enough sleep or are you partying your little butt off all weekend? We all need sleep, try and get at least 7 hours of sleep every night. As we get older we need to rest and make sure we do not over do it. If your a late sleeper try and cutting a half hour of TV a week and getting to bed half an hour earlier.

Yoga and Mediatation These two literally changed my life. I used to be a very anxious and stressed out person until I was introduced to meditation and yoga. It not only relaxed me but it's now a way of life. The simple things become beautiful and the harder things less important. You learn to love yourself and take care of your mind. It is used with people with bipolar syndromes and has proven its worth.

Support groups Sometimes it helps just to talk about it or about what is getting to us and stressing us out. Sometimes all we need is someone to tell us, its not so bad to move on to better things.

And if you've tried all of the above and still experiencing these mood swings then I suggest you see a doctor and tell him you need some help.

Good luck

Oh ! I'm not eating right, not doing exercise nor getting enough sleep.

I think that's the main reason behind it

Changes in mood are a normal part of human experience. For those that want to have more control over one's own moods, learning about emotional regulation skills can be useful. Searching online for information about emotional regulation skills or consulting a counseling or psychological professional can potentially be quite useful for some.