Benefits, pay increase given to male colleagues only

My boss has decided after 23 years of impeccable service that I am a poor employee due to complaints from my male colleagues that it isn't right that I make more money than them. Since I started this position, my job has always been the highest paid position due to state requirements of posession of a bachelors degree. No other position require, by state regulation,a bachelors degree. Since my colleagues complaints, my salary has been cut and theirs raised so that I am now the lowest paid manager for the first time. My colleagues are allowed to leave early without notifying the boss, get straight pay for it, and are not required to use any accrued time to cover it; I must use accrued time even for 5 minutes. They are allowed to leave for an hour during lunch time with pay and I am allowed a 20 minute lunch. They are allowed to choose whether or not to work holidays and accrue the time; just recently I am not-I am the only person required to take the day off so as not to accrue time. I could go on and on. This all started when I received an increase in salary and got worse when I went on FMLA. Since the discontinuation of FMLA the harassment has not improved. My evaluation was also bad due to FMLA time off and specifically said so. I am at the end of my rope--can I fight any of this at all? I have tried with meetings and letters to no avail. It is going to be difficult to hire an attorney due to my cut in pay. Thank you very much.