Hilo,
My wife was with me most of the time, my brother also helped. Try to find someone else, friend or family that can help out. There is a lot of time spent just sitting especially during the chemo process. My wife would disappear to the hospital library to build a community jigsaw puzzle. She enjoyed that and I enjoyed talking to the other patients.
What I'm trying to say is you won't need to be there every moment anyway. After a couple of weeks of treatment I slept most of the day anyway and I know I wasn't very good company. I wanted my wife to get out and go do something. You are earning money I'm sure you all need.
Talk it over with your husband and let him know how you are feeling.
Tim