Firstly i'm glad you took action to post and are trying to do positive things. It sounds like your mental/emotional issues extend beyond speech. Stuttering can play a part, but not even care about social relationships and such sounds like a deeper issue. I'd really recommend seeing a psychiatrist (if a really really good psychologist if you can find it). If nothing else, it will feel good to have someone to talk to and unload all this inner weight. It could be a healthy and safe stepping stone to regaining your old social skills and social appetite. But searching out a good psychiatrist and making the appointment is going to be the toughest part, so go get it and best of luck!