Hi guys,
I've never, ever done this before so I'm pretty certain to mess this up.  Anyway, I was wondering if anyone might be interested in taking this idea and running with it:

Sam's memories from hell threaten to overwhelm him every moment of every day.  To calm the storm in his head, he comes to rely on either drugs or alcohol (or both).  Dean allows this to continue (for now anyway) because he doesn't know how to help Sam and he can't stand the screaming.  
So, can anyone tell me if I did this whole thing right?  My sincerest apologies if not!!