Hi AK,
Sorry to hear you are stuggling with these feelings of guilt weighing you down.:(
B.C. has offered some great suggestions, so try and move foward with these ideas...
...as well as trying some journaling if you've not done so already. Processing your feelings in writing will both help you to accept them, and then let them go...or make changes if necessary to move on, beyond the past.
You can do this on your own...'diary' style...
...or use this worksheet if you find free form writing not to your liking.
http://www.get.gg/docs/Options.pdf
Wishing you peace and progress!
S.C.