Hi prettyexhausted,
I'd like to join

Mutt in welcoming you to bpdfamily. I'm sorry that things have gotten so bad in your relationship, and that financially you are struggling. That is very stressful and anxiety-producing. I'm glad you reached out. This is a great place for support, because the members here have been in similar situations and understand what you are going through.
There are also tons of tools and resources to make things better for you and your family.
Do you have friends, family, and/or a therapist whom you can lean on? It's important to rally a lot of support around you; you need your strength for yourself and your son.
Some areas offer free legal advice during certain times. It might be of benefit to check that out in your town or city.
You mentioned an abusive environment and that your husband is dangerous to your welfare. Can you say more about that?
Hang in there. Keep writing and let us know how we can help.
heartandwhole