Stubborn partner

Any one on here who has to deal with a stubborn, hardheaded partner? My husband has late stage iv lung cancer and advanced COPD. He has had two chemoimmunotherapy treatments so far. His symptoms after wards have not been good. He vomits daily and can't eat anything without throwing up afterwards. He has been given compazine which did not seem to work for him. Now he has zprexa and zofran. Just got those ones yesterday. Hopefully he will start to feel better. But what makes me angry is that he won't try anything I suggest. Was going to make him peppermint tea with honey. He told me he does not like tea. There is boost in the frig which he won't drink. We have gingerale. He did try once, but threw up shortly after drinking it. I suggested crackers and he said he did not like crackers because they are dry. I said I can add oyster crackers to you soup. They will get soggy. He said NO. He never drinks water. Only coffee and milk. Bought him gatorade and he said I don't like it. He won't drink milkshakes. Did make him two weeks ago and he said he did not want to drink them anymore. I am at my wit's end. He weighs 92 pounds and is 5'10. It does not matter what I suggest, he doesn't like it or he makes some other excuse. I know that he is dehydrated but he won't even think about drinking water. We all do things that we don't like, but if it is going to help,, most of us will try it. Not him. And sorry to say, but I am TIRED of it. Last Sunday, I ordered ginger and peppermint tea from amazon. Guess I will be drinking it. Guess I will just have to watch him disintergrate into nothing but bones. Sorry for the rant.