.
Hope you can talk to a lawyer. Does the job think you're using illicit or street drugs? Would they have a way to prove that? To me it sounds like you were fired without cause or proper counseling. If you had a contract with them, read that. How long were you there? Did they require you to state upfront anything about your mental health or prescription drugs?
I'm not sure about unemployment vs temp disability, you may be eligible for either. Is there any way to not for lose the house?