So sorry about the job, Liz. I live and work in FL (an at will employment state) and know that in my company, before anyone is terminated for "job performance" reasons, much is done to lessen any chance of a lawsuit. For example, meetings between the employee, manager, and HR are held, everything is documented, signed by all parties, and copies are given to all parties. I would bet that your company is expecting you to take legal action and will have a settlement offer in place. Get a really good lawyer. You are probably in multiple protected classes. And your dirtbag former employers can go suck a duck. Hang in there.
Trish