Do I have grounds to sue my employer for creating a hostile work environment?

I am a mechanic and have worked at a shop for last 15 months. I have had it with my employer. I make a flat rate which is like commission. When you work on a vehicle, the book says how many hours you get paid for the job. He has been decreasing the number of hours I am supposed to get. Also, I had refused to work in unsafe conditions 3 weeks ago because I got electrocuted several times because of faulty wiring in the shop and forced him to get it fixed after a year of having this issue. Since then, he has quit giving me work and treats me very poorly. He does not listen to my professional opinion and has been making a hostile environment. I told him I was going to apply for unemployment and he said he would fight it. I am very angry about this situation and not making money. I don't know what to do.