Yes, I was coming here to say this too:
"TBH his health problems are going to dwarf the sex problems soon anyway and you will come to resent that he didn’t care enough about you to try to resolve them."
Yes, he will suffer if he gets a stroke or heart attack or a non-healing wound that doesn't kill him, but so will you, OP. YOU will be the one sitting at his hospital bedside, nursing him at home, cleaning him, taking him to one doctor after the next, and doing all domestic and mental work as well as working. It's very hard, grinding, and exhausting to be a carer.
It's one thing if someone becomes disabled because they have unlucky genetics or had an accident. It's not their fault. It's quite another to refuse to seek medical attention while being hypertensive, pre-diabetic, and overweight and then getting a stroke that means you will not be able to walk and/or talk and will need years of rehabilitation.
My pigheaded FIL was like this. He literally ignored his own towering BP while he himself was a practising medical doctor (!!!) and boom, at 56 he had his first stroke. Unbelievably, that didn't teach him either. He avoided taking his medications - because they made him sleepy - until the whole family was on his case, then he pretended to take them. So then he had his second stroke, which rendered him unable to speak properly for 6 months. A third stroke took out his ability to walk properly. Then he had a stomach rupture because he was mixing alcohol with his medications. Then he fell and had a painful nonhealing sore for a year... It just went on and on and on. The whole family suffered, but especially MIL. He only started complying when she threatened to put him in an old folk's home - she had the papers drawn up and everything. He made it to 79, which was a miracle of medicine, but he was really really unwell and extremely unhappy and depressed for the last 6-7 years.
It made everyone, including my H, very upset with him, and utterly determined to do the maximum possible to live healthily and seek medical care as much as possible, to spare their own partners and families from having to go through this.
Honestly, OP, what your H is doing is utterly reckless, not just with his own health and longevity but also your quality of life.