I'm sorry.
I can't begin to comprehend what its like to lose a son and I can't really say I know how you feel because I've only ever lost family members older than myself, but all the same I'm sorry. I wish I had a very deep quote that could make you feel better in some way or to help you move on, but if I find one I'll post it.
All I can think of is that you should remember your son for who he was and that he probably wouldn't want to see you in a depressed mourning state. I'll stop babbling now...
My condolences
T.R.