I am sorry to hear that story. I strongly recommend to hire an immigration attorney. I-751 waiver process is a complex process.
This answer is of a general nature and should not be relied upon as final, nor is it intended as legal advice. Consult with a qualified attorney before making any legal decisions. Gen Kimura, (832) 247-6932.
You do not have to be divorced from your abusive spouse if you seek the battered spouse waiver. You should retain a lawyer or BIA credited non-profit representative to do this for you.
Daniel Green, Esq.
Location: 684 Aaron Court, Kingston, NY
Mailing Address: PO Box 3238, Kingston, NY 12402
I agree with my colleagues. There are several charitable groups that can assist you such as Catholic Immigration Services. You do need an attorney to assist you.