I'm Done

My fiancé and I have been together almost 3 years. We used to treat each other so much better than we do now. He was in an accident a while back and is in an incredible amount of pain. He gets better every day but I feel like he takes out all his frustration and anger out on me. I am there for him at all times. I wait on him hand and foot. It wasn't until recently that he could walk again and start to take care of himself again. But little things like I'm not moving fast enough will make him irritable. Also if I just ask if maybe we could change the channel he throws a tantrum. It's little things like that that set him over the edge. Right now as I am typing this he is all pissed because I said I wasn't doing the dishes today. (I just barely got off working the overnight shift and he is unemployed.) I don't know how I can continue to be in a relationship with someone who is constantly angry and acts like I'm such a bother. I don't know what to do anymore to make him happy.