Pion dwindling; how do you rev up the ual pion?

I’m in a committed long distance relationship for 3 years with an amazing man. We’ve talked about getting engaged and I’m very excited over the prospect of being able to call him my husband. He makes me so happy and inspires me to be a better person. We are eager to please each other in the bedroom. He tells me I please him (as I make a great effort to do so) but there are certain factors with him that make it difficult for him to please me despite my openness and comfort in telling him how to do so—I meander on the line of not wanting to hurt his feelings so I choose my words. For instance, he has bad allergies that cause him to be permanently congested with post nasal drip. So he is constantly coughing to clear phlegm from his throat, burps, and has permanent bad breath (from the post nasal drip) all during lovemaking. I tell him to go to the doctors because I think this is a serious medical condition, if not allergies, something else. I am worried about him. I even offered to take off work and drive 3 hours to his place to go with him. But he refuses to go. He also cannot see very well and wears bifocals but when he takes his gles off he cannot see or sense what he is doing. For instance, when going down on me, I tell him how I like him to please me but he still hasn’t quite figured it out and it’s been 2 years we’ve been doing it. I tried reading books thinking books would have a better way of explaining how to please a woman and suggested we look at books together but he looked at me like I was nuts. I want to encourage him more so these changes can be made because these things are really turning me off in the bedroom and lessening my urges to want to make love to him. It is not fair because I love him and want things to improve. I talk to him about wearing cologne, chewing gum, or eating a mint all while lovemaking but he doesn’t do it. He only brushes his teeth, that’s it and honestly, it doesn’t seem to make a big difference. It’s good when my nose is stuffy because then I do not have to smell his breath.