Ask your family in Texas for help in moving. Whatever it takes, accept any and all help. There's no shame in asking. Even if it means moving in with a sibling or a parent. If your custody agreement doesn't prevent you from moving out of state then go. It doesn't seem as if your former husband would care about custody visitation anyway except in how it affects his ability to hurt you.
I do hope that you're not upset over the fact that your former husband has seemingly moved on with a new romantic interest. I believe he's only taken up with her in order to use her for her living arrangements. He gets to live there likely rent-free AND he gets to spy on you.
I would also suggest staying away from dating in general for a while... a long while. You're so fresh out of an abusive relationship that additional romantic entanglements only complicate matters even the guy is supportive and Prince Charming. Continue working on yourself and keeping you and your son safe. Work on getting out... you may be no longer legally bound to your former husband, and not legally bound at all to this new guy, but they're both still very much in your present and affecting you.
When it comes to your finances, you simply have to take it one step at a time. You should be able to call each of your creditors and set up agreements with them telling them what you CAN afford each month and getting on a schedule that is doable for you. See if you can get a consult from a financial adviser to help you out with this. Possibly through DSS. That brings me to:
Get in touch with the Department of Social Services. I believe that you qualify for legal aid and likely additional services even if you don't qualify for WIC/SNAP. Tell them your situation and being a woman in an abusive relationship with a former spouse AND former boyfriend with limited finances likely qualifies you for some services, especially having a small child. At the very least they should have some financial advisers on hand to help you and not charge you.
Make absolutely certain that you call your bank and have your debit card reported stolen and let them know the last purchase you made with the date, the amount, and location of the purchase. You shouldn't be held accountable for the loss and they should be willing to reimburse the account. You also may have to file a police report.
There ARE things you can do to move forward. I'm so sorry that these things keep piling up on you. It's not fair and it's not right, but I know that in the end you'll be stronger when you come out on the other side.