When I quit my university job...I sent letters to the appropriate people w/ a two week notice. I couldn't stand the thought of staying there any longer because the way things were done up there, etc. AND the thought of staying there TWO full weeks after giving notice made me soooo sick because there were lots of higher ups there that were very spiteful....I just dreaded having to deal w/ them for TWO weeks......well, they didn't give me two weeks...they hired a temp to take my place, and had someone from the main office come to train them. So, I was out of there! I have never looked back.
I admit...I was nervous about quitting, but knew it was the right thing to do...and the longer I thought and worried about it, the sicker I made myself.
Do it..........and don't look back.......it will be a great turning point in your life!