Recently, I changed my website's title and my pages title to improve the SEO (I have wordpress using All in One SEO). Now it seems today I'm not showing up on Google first page results like I normally do. (I'm not showing up for any of my keywords at all) If I was to search my domain name, like if it was XXY.com and I search XXY it doesn't show up. The only way it would show up is if I search XXY.com or http://www.XXY.com. Also today I have a large discovery of backlinks, around 600 or a little bit less (yahoo). Also when I search my website, normally because of I have sitemap set up it would show my other pages in the result (when I search my domain), but now it is just my homepage showing up (the changes I made in the title didn't show up though). I have webmaster tools, and I don't see anything wrong there beside not having a robots.txt. I never had that to begin with, but I just put one up, just in case. Any ideas?