I sort of understand what you are going through. My Hubs snaps at me all the time. For him this is considered normal behavior as he snaps at everyone in his immediate family all the time. I used to be on the outside of it but I guess I've been with him long enough that I am fair game too.

It does wear you down. You can either stick up for yourself and argue all the time or just continue to be an emotional punching bag. I've chosen to just walk away now literally. I go for long walks or just shut myself in our bedroom. I recently lost my Mom and don't have any friends so there is really nowhere to turn. I can't leave right now cause I am not working and have no other means of support. I feel for you.