My suggestion is to ensure that you are protecting yourself in the divorce agreement. That is first and foremost right now. I highly suggest you have an attorney review it.
You need to take a stand for yourself. You are the only one who can do it. Do not let her manipulate you. You cannot trust her.
I would fight to have shared custody and I would definitely have the attorney run the numbers on any spousal/child support. Knowledge is power.
Btw, she has her own set of problems that she needs to work on. This isn't all on you. Fix what is within your control. Of course after you see an attorney if you haven't already.
Me:45 ExW:48 M:04/97 3 Bombs & 2 ReCons 1st BD 11/10 D Finalized 4/20 D-16 S-14 Going in one more round when you don't think you can. That's what makes all the difference in life.~Rocky Balboa