I'm heartbroken to hear about what you have to endure. It must be such a terrifying experience to be stuck with the person you thought loved you, just to realize that they abuse you, with no option to escape them.
I also suffer from bpd & chronic pain. I can't imagine the pain you must be in but maybe I am able to help a bit with sharing my experiences and thoughts on this.
I live with my ex who got absolutely furious once, I was scared about my safety. If you notice your partner threatening/harming and scaring you, a temporary place to flee to is the
hospital. That's what I did when things escalated in my home. Since I have a history with mental health issues, I stayed the night in the psychiatric (area?) thingy. They were really kind to take me in and I can definitely recommend trying it to ensure your safety in emergencies.
In the long term, I think you could look into assisted living options for people with disabilities! I'm also looking for one since I want to get away from my ex but cannot run a household by myself. There are options with 24/7 help and ones that assist you with every day chores like shopping, cooking cleaning etc. that you can apply for. I recommend applying for the ones you can find in your area. They will most likely require a disability pass so it's important that you see what you can apply for with your mental illnesses and chronic pain! If you have questions, feel free to pm me. I truly wish you all the love in the world and hope that you find a safe home :( You are worth it, you matter.