WHAT ARE MY LEGAL RIGHTS ?

I have been working for this company for almost six years. Last year, I was promoted into management and was sent to Illinois Upon my arrival, it was clear that things were not going to work out.I have been mistreated in every sense of the word. I know how difficult it is for me to quit because I had just relocated my family. So I tried to hang in there. Two months later, I tried to obtain a job transfer to another state with the same company since I never had any issues with my previous bosses. The supervisor from the other state was very impressed and offered me a job. Upon hearing that I tried to transfer, my boss threatened to write me up and belittled me in from of my peers. He said to me that I needed to be here for a year before I can get a transfer. The HR then called the other place that I was trying to transfer and stopped the transfer.I never sign a contract. Things deteriorated from that point on. He has writen me up four times. He made life hell for me. Now, I am forced to quit my job. Is there any legal recourse for me? Can I file a constructive discharge. by the way, I still work for this employer. I have about two weeks before I leave without any other employment