I don't know if you work or have any "control" over any money or anything like that? I would go to a counselor for a few sessions and then maybe to a lawyer and check out various options for you and the kids. I remember when I was having trouble at work with no possibility of change and my therapist pointed out I could stay and get depressed or I could leave. Sounds like you might be at that point.

If you need help (especially with your pregnancy) then you need help! If he isn't giving it or getting it for you, that's not a good sign. Don't use his disorder as an "excuse" for him to behave badly. Is he seeing a therapist or doctor (how did he get diagnosed)? As much as you love him, you may have to let him go at this stage in his and your life in order to protect yourself and the children. I would try to get some control over some of the money and/or spend whatever time you have left before things get worse to make a plan. Filing first for divorce gets an "edge;" I would at least see/get a lawyer and see if anything can legally be done to help the situation (like getting you control of some of the assets because of his past behavior, etc.) and to get a "support" team in place for if/when things get worse and to use to show him you are serious and supported (so then he'll have to make some decisions about his behavior or you'll leave him or throw him out and make his life a little less comfortable to him).