white screen of death vs. fatal error memory allocated

Ta-daa!

So early this afternoon I came across a very, very bizarre problem on my blog (http://www.alicetragedy.org/blog)

the main page (front-end) was showing me a fatal error // allocated memory message and redirecting me to line something something of akismet. Since I couldn’t log into my admin area, I did a quick fix by renaming the akismet plugin folder, and it worked fine. a couple of hours later, same thing happened but with an error on a line of another plugin file. It was something I wasn’t using anymore and had deactivated, so I deleted the folder. everything turned out ok, but since I could log in again, i thought it better to go through some of the plugins and double-check that I only had activated the ones i really needed.
having gotten home from work, my site threw another similar error.
I tried all the fixes to bring php memory up a notch, but having a php.ini + .htaccess + n extra line in my wp-config file worked.

About an hour ago, I again couldn’t access my blog.
Problem this time: white screen of death.
I’ve tried various things, including reverting back to 3.5.2, but nothing seems to be working.
The strange bit is that I have not changed anything on the site in the last couple of days (my last post was before the weekend and everything was fine after that), so I really don’t know what’s going on.
help!

since my alicetragedy.org site works alright, I assume it isn’t a problem of the server being down. I’ve tried turning on the debugger, but it shows me NO ERROR whatsoever, and the log gives me only 200 status codes, so…. now what? I’m lost.

also, out of curiosity: is there a way to backup my database from the control panel of my host server? can’t remember when was the last time I backed up, and I’d like to be 100% sure of nothing huge getting lost before playing around too much…

Thanks in advance! xo