Sorry, need to vent.

I started doing contracting work for a company 18 months ago. It was supposed to be part time, but the workload has grown to the point where I am working close to full time hours for this one place, answering calls/emails 7 days a week. I'm so drained from dealing with this company that I am not pursuing other clients or opportunities.

I'm being pressured to quit contracting and work full time for them. I don't want to, but I also don't want to give up the work at this time of year. I do not want to do this kind of work for other clients. I hate my field (IT).

I'm also upset because they are paying other vendors and contractors a lot more than they are paying me. They had me get a quote from someone to install some equipment. They thought the person charged too much, so now it's going to be my job to install all of it, for 1/4 the price.

How do you disengage? Stuff happens at this place that just makes me so mad. I come home and I'm angry and upset about what happened during the day. All I want to do is vegetate, binge read novels, surf the web. I wish I could replace this income some other way but I am so tired and discouraged at the end of the day that I can't even think about how.