was fired after 18 yes on the job for no reason. company is not an at will company. I sign nothing

I don't see any case.  First of all, you resigned, so even if the firing was unlawful, what damages did you suffer?  Second, you say that you were not employed at will, but you also said that you signed nothing.  Absent a contract limiting your employer's right to terminate you (which can be an individual contract, a union contract, or can even arise from an employee handbook), you are employed at will.  Your employer can fire you for any reason which is not prohibited by statute (e.g. race, gender, nationality, religion, etc.)   I hope your husband recovers quickly and fully.