You have a lot to deal with. Honestly, you have described so many real problems. Your mom's mental illness, yours, job loss, and the fact that you are stuck in a terrible environment (can't cook, etc.).
Obviously, a new job search has to be a new priority. If you find a job in the future, maybe see if you could be a roommate somewhere? You said that you've been paying you're mom some sort of rent anyways. You probably already realize that a new environment might help your mental illness. And, obviously, there are many who post here who are also trapped in less than desirable environments. But each situation is painful in its own very real way.
Still thinking of you. Myst