If someone makes a verbal contract that they do not keep, how can i prove it?

I agreed move in and care for someone who is terminally ill for 2000.00 a month. It was a verbal contract in which I have 3 witnesses to. Living expenses were not included in the 2000.00 a month agreement. 7 months later, I have not seen any money for the services that I have provided. I was verbally abused after only 3 months, and after originally being told my daughter could come on weekends, was no longer allowed to have her here. Told to leave in the middle of the night with no where to go. Saved his life after 2 suicide attempts, one of which was in front of my 4 year old daughter. Put up with the abuse and being called names because I needed the money that I was told I would receive.