I agree with perna, practice practice practice! I get what you mean about forgetting how to talk, and especially about not making eye contact. Its going to be harder to change because you are still in the negative environment - that i think will affect you more than you realize. I would try reading stuff out loud, or into a mirror. I wonder what actors do. Can you get a one-day volunteer job, or a weekend job doing product sample handouts at a grocery store? That would force a lot of eye contact and speaking all at once and maybe get you over the hump.