
Can anyone give writing advice please? Should I call it a day?

Can anyone here give advice to a new-ish freelance writer please?
I started freelancing in February this year and I'm now charging $20 to $30 for 600 words (depending on research). So far, I've had happy clients, with some coming back for repeat business. I then joined Elance and got hired for blogging, writing posts at rate of $15 for 350 words.
I've run into problems. It started well, but I came down with bronchitis and was very poorly. I didn't want to let the client down, so wrote the posts anyway. As you can imagine, they weren't as good as the others I had sent. First mistake.
I was also started worrying that I wasn't fitting enough information into these short posts. I tried to make them full of facts because I was worried about them being 'fluff'. This was the wrong approach. My client didn't like the work because it was the wrong style for them. Fair enough, the client is always right.
However, (this is where it gets weird) they also told me that that the posts were coming back with an increasing number of spelling mistakes, and the flow was wrong. Now, I truly want to do the best for clients, and I'm not out to rip people off. So, I asked my dad (a retired English teacher who got his BE at Oxford) for a second opinion. He couldn't find these spelling mistakes that I had missed, and he also thought the posts were written in a logical fashion. Why would the client say this?
I'm not sure what to think now. If I'd been slacking, I would just take it on the chin, but I can honestly say that I've been doing my best. It seems that I can't do anything right with this person and their emails have started to become a tad rude and sarcastic, but I can accept that I'm at fault here. I have started to feel like a nervous wreck and I don't want to carry on working for them! Maybe this means that writing isn't for me.
I'm going to suggest to the client that I'm not a good fit for the job, but will continue until they find someone who is. Should I call it a day with writing? What would you do?
Thanks if you made it this far!
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Cheers, Laurence.
Writer/Editor/Proofreader.
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