What if My Husband Won’t Go to the Doctor for His Low Libid0?

I wanted to copy and paste word for word to my husband the words in "how to approach a spouse who isn’t interested in having se×", but I’ve written him long texts in the past on this topic, and he told me that as soon as he sees it’s about se× he stops reading. He asked me nicely to stop talking about this, but I don’t know what to do but keep talking. He hasn’t initiated se× in over two years, and in that time we’ve only had se× 4 times (3 times last year), all with no participation on his part; no kissing, no touching, he can’t even open his eyes unless they’re glued to the Facebook feed on his cell phone which ALWAYS seems more important when I’m trying to engage his interest. He’s told me it’s not me, that he’s just getting older and it’s just a fact of life (he’s only 46). I want to encourage him to see his doctor to find out if there is something wrong, but anytime I bring it up, even trying to be as gentle and understanding as I can (I don’t yell, or say anything after a failed attempt at love making, etc.) he flies off the handle, tells me I’m being selfish, and tells me it’s conversations like this that turn him off. I asked if he could simply check to see if he could switch his cholesterol medication, because I read that some of those can effect libid0, and he wouldn’t hear of it. He won’t quit smoking, change his unhealthy eating habits, get his testosterone levels checked, etc. He says it’s his body and he’ll do what he wants with it. I’m at my wit’s end.