Sorry to hear about this! And I agree with Sab...sounds like your cousin has borderline personality disorder, which is very hard to live with. Her husband needs to get her some serious help, or she really may wind up injuring or killing him.
I'm not sure about Texas, but here in Ohio hospitals have a program where all or part of your bill may be written off based on the patient's income. And your daughter is going to find out that you're no longer living at your cousin's house when she goes over there to cook on Sunday. Eventually all of your adult children are going to learn of your situation, and they will be very upset about your living conditions. At least go to your kids for a small loan to get you through. As annoying and crazy as my dad is, I'd feel so bad if he didn't let me know that he needed help with something.
One last thing...you can tell the debt collectors to stop calling you. It's better if you send a cease and desist letter, but you have bigger fish to fry right now. My fnancial budget is really tight, I can help you with researching rograms that may help if you want to pm me your location.