I've been making my living online for the last five years (unbelievable considering my lack of technical knowledge). I'm in the teaching niche and my site was ranking very high (pos #1 and 2 for sevreral terms) until I instructed my techie to install an XML sitemap. Now we are non-existent for the terms we had - in fact, my site has been missing for three weeks now.
As I understand it, it can take up to 4 weeks for Google to trawl the site again but I'm getting worried we might have done something wrong. Can anyone shed any light?