I'm angry, frustrated, and resentful. Father-in-law moved in few months ago and it's been a nightmare. What do I do?

I was taking care of my mother in her home after a major back surgery when my husband called me saying that his father showed up wanting a place to stay. He had left his wife of over 30 years because he was tired of her telling him what to do. Once my mother was released from her doctor, I was then able to go home. FIL didn't know what medications he was taking, he didn't even know his doctors names or address. His insurance on his truck lapsed and he owed 1,000s of dollars to people "borrowing" money. He is a Type 2 diabetic, COPD (still smokes), congestive heart failure and heart disease (aren't these the same)? My husband spent hours going through a grocery sack full of bottles to get his medications correct. He made an appointment with his primary and went with him. In the meantime, I come home from work and he has his used needles dumped out on my kitchen table looking for a couple of good ones to re-use. Another time I come home and he's sitting in the recliner in his tighty-whities with blood running down his arm and all in the chair and on my hardwood floor. He told me the show was good and it will wipe right up. During the day he goes to the store and buys 3lb bags of candy, pop and goes to fast food places. I have changed our grocery list completely to accommodate his diabetes and cook heart/ diabetic healthy meals for him and it's just a slap in my face. He saw a commercial on TV about "free" coverage and he called and cancelled his supplemental insurance and signed up for this other insurance that doesn't hardly cover anything, nor is his primary and cardiologist in the network or a decent hospital.

There's so much more. This last week he ended up in the hospital as he was bleeding internally from the warfarin he was taking and had 0 iron levels. He came home last night. He called his other son, my husbands brother, to come get him - he left AMA. Why? Because my husband was smoking a brisket and he wanted some. I'm beyond mad, angry, frustrated in regards to his selfishness. He never should have "left".... he doesn't have a penny to his name so we are having to foot bills for him now, we aren't medical caregivers and are not home a lot. My husband works two jobs and I work 60 hrs or more a week AND run a furniture refinishing business on the side also. FIL said this morning, he was up all night, couldn't breathe and didn't feel well. I told him he never should have left the hospital AMA and that we have to work, I guess if you feel that bad, call an ambulance to take you back to the hospital. What you are doing is selfish. I left........... I'm a horrible person. I don't even want to go home, my husband doesn't know what to do and legally, he is still married so any help that he could be entitled too and/or qualify for he doesn't because they look at both incomes. He only gets his SS. I'm afraid he will never leave.