Want what done to you? There's a difference between being frustrated when he won't go to the doctor over something totally treatable and not knowing when to let go/pull the plug/whatever. We were perfectly happy to honor the DNR my grandmother wanted.
Sorry, there was a post above mine that was apparently deleted that I was responding to. I am not equating a DNR with your situation.
I have been in your shoes with both of my parents. I had to move in with them because of their health conditions. It is so very frustrating!!! Especially when I am an RN and KNOW what they need to do!!!!
All you can do if he is in his right mind (not that he is making good decisions, just that he is oriented to person, place, and time) is make the suggestion, tell him the consequences of his decision, and live with whatever he decides. And I know exactly how difficult that is. Especially when you know that he may end up in the hospital because of it. I ended up using the, "I have too much going on right now for you to be in the hospital, so it would be an enormous help to me if you went to the doctor to try to avoid that." reason to get my mother to the doctor a couple of times.