Was terminated for a job for attendance. I am an RN. The nursing manager termed me the day before thanksgiving after working all day long

I tried to fight the termination bc I know it was more personal than the reason they saying they were terminating me. I had FMLA and a couple of months prior to them firing me she e Mailed me saying she was "miscoding@ my time and FMLA days, low and behold I was fired a month or 2 later. I never signed any paperwork a saying Anything about being terminated and now I have been turned away from 2 jobs bc of information they gave to a data base about me being terminated and the specific reason for attendance. Given the circumstances my career is ruined bc of a manager not liking. Me and working the system to assure I would have a nearly impossible chance of getting another job.... Please help. I am an EXCELLANT, caring, knowledgable RN.