Too much memory causing site to time out?

Hey Guys,
Apologies if this has been covered, I have done a fair amount of searching and haven’t come up with anything. My site was working fine yesterday (http://www.lonelymarketer.com). This morning I was writing a post and after pressing the “save and continue editing button” in the admin panel I just kept getting “transferring data from http://www.lonelymarketer.com” at the bottom of the page. After awhile I closed out and opened back up to see my work as saved. I went ahead and published…getting the same timeout error. My post did publish though.

I went to my home page which opened up very easily and tried clicking on an individual post. It just hangs up saying at the bottom, “waiting for http://www.lonelymarketer.com”.

I contacted my web host and we did a variety of tests and everything looks okay. The database also checked out okay. After some more tests they said it looks like the scripts for the sites are being killed off due to too much
memory usage. I should also add that Feedburner can’t grab the feed from the site either.

I deactivated all my plugins and loaded them up one by one and still can’t figure it out.

Does anyone have any suggestions on what I can do to fix the problem?