I still think you have a case for wrongful termination due to health issues.
Litigation is expensive and most companies will offer a settlement.
Most lawyers who specialize in employment law operate on continencies. Your prior employer has deep enough pockets that you should be able to find representation.
And another Pede said to seek SSI. That's a good idea since your health issues make it difficult to work. Figure that for years, you paid into the system.
Lawyers who specialize in employment law probably represent clients who need SSI. That would be a question to ask when you are considering representation.
Have you considered suing due to wrongful termination due to your disability?
Sounds like your employer might have been waiting to fire you given your health issues.
Contact your local bar association and ask for referrals. Many lawyers will take cases on contingency so you don't pay if they don't win.
Prior to your firing, did anyone associated with the company remark on your health issues? Ask about health related absences?
You would appear to be in a protected class for health issues. They can fire Trump supporters at will so it would be wiser to be quiet about your political leanings.
Stable genius.