@Helpkel36,
I don't believe you can change someone's sex drive to suit the other party. You are either a sexual match or you are not.
He needs to compromise a little. You don't exactly state what type of "pain" where that pain is, that he is suffering from. Mundane boring work, is just that and perhaps he feels that he has to contribute something but he may also have depression over the illness. Any one that suffers pain either sucks it up and deals with it, or tries to and finds it hard or gives up. Depression sets in and sex sits further down the list of important things.
If you entered a relationship knowing you had a high sex drive and he had a low one, it's tough.
Here is the thing too. So you initiate it 75% of the time. You know that he has a low sex drive and an illness and possibly depression. You know he suffers from stress. Don't take it personally, you love sex, initiate it in that knowing, it's not to be taken personally..
Here is one more thing. Perhaps he "feels" that by having sex with you, that's what it is sex. You have a high sex drive. Some guys hate sex but love intimacy, feeling that they are wanted and loved during the "love making" and not a machine to be used for sex.
Always hug, kiss for no reason... Both parties deserve and want to be loved and know that they are.