Unfairly Treated?

I worked as Acting Housing Program Manager and saved the program from being shut down. For four months I asked for more money, no compensation. After working 50-60 hours a week and literally working myself sick, they stated that they could not give me the position after all, even though they were elated with my performance. Because of a legal suit, the old Manager was going to get her position back.(Even though it has been proven that this employee stole from our company. 1) Giving her the position back was never in the original suit, only compensation 2) This job was never posted and this is our company's policy. I was never even given the opportunity to apply 3) Since receiving this information I have been very ill and have been medically taken off of work. 4) They want to give me another position which boils down to a secretary position. I just want to know what my rights are, please help!!!!