Relocation contract

I have recently taken a position where the last manager was promoted. I signed a 12 month relocation contract where I am responsible for part of my relocation if I resign prior to a year of service. I am in an environment where I manage union employees and I am employed by a seperate contract company.

My employees are all female. The last manager was a very laid back, attractive young man. I am a female. The employees have told me that they feel the last manager will come back if I quit. There have been numerous false accusations against me. There was an unsigned letter sent to my boss that was easily proven as being lies. I have had a bad experience when addressing my boss about the issues. He told me that the last manager had the nick name of "sex God" and that the last manager would "flirt with the young ladies, and the older ones would mother him." My boss is sending me to a training seminar for people skills to appease the union. This will not work. I get harassing phone calls from my employees at home trying to pressure me to quit. The Union has told me they don't like my company and feel that my job should be held by a union employee.

I have six months left on my relocation contract. Does the hostile work environment give me a solid ground to quit and not repay the relocation contract? I am literally losing sleep and suffering depression from this position. Can job stress be cited as a reason form leaving employment? I want nothing from my employer but to be able to leave. The contract company I work for does not support me and I barely see them.