First of all, get a lawyer. I went through the same thing, and talking with lawyers helped me get my head set correctly. There are various firms in SV and TX that focus on this sort of thing. I don't remember their names, but a web search will surely help you find them. Talk to the lawyers, tell them what you want, and what you got. Then have them take care of things. Otherwise, you might end up being liable for stuff you did not know about.

Also, a lot of companies do this to take away your focus. Don't treat the buyout as something real until the money clears. Otherwise, focus on the business.