Hi borderlyme
You haven't been here for quite some time indeed, welcome back The circumstances that have led you to return here are quite unpleasant, but I am glad you are reaching out for support.
Living with disordered parents can be very challenging indeed, especially when you also have health issues to deal with.
Do your parents in any way acknowledge that there might be something wrong with their behavior, particularly the way they treat you? Have they perhaps ever gotten any kind of treatment or therapy for their issues?
It's unfortunate that you now find yourself living with your parents again. It (for now) is what it is though. Since you are there living with them it might help to take a look at some resources here that can help you protect and preserve your own well-being.
Do you feel comfortable setting and enforcing/defending boundaries with your parents? I've selected some resources that I think you might find helpful:
Setting Boundaries and Setting LimitsBOUNDARIES: Examples of boundariesAssert yourself: D.E.A.R.M.A.N. techniqueTake care