Where did you meet this guy and I take he's not the father of your son? You need to "unload" this man ASAP. Sounds to me like he's taking advantage of you and maybe he's bipolar or something. Why was he in a homeless shelter for the first year of your marriage in England and you lived over here? His lifestyle obviously has improved after marrying you but yours has not.

You need to start out fresh again without him. Get one job and spend time with your son. What example are you setting for him? That dads sit around and play on the computer while moms are never home and at work?

You don't need this man. Don't let him rob precious years of your life and your son's. I would just quietly one night pack up everything and see a divorce lawyer right away. Good luck. Hope this didn't sound too harsh, but I hate to see you being taken advantage of. You're a hard worker and you are not mentally ill, maybe just mentally stressed out.