Tolerance
Tolerance
Tolerance

After 28 years, I have learned that it's not about Love, or togetherness, or 'opposites attract' or any of that nonsense.

First and foremost, it's about what you can tolerate. What seemed cute when you were dating becomes not so cute after a while when you're married and the 'new' wears off.
Secondly, you have to be friends. No exceptions.
Finally, if he's not interested in learning about your illness and supporting you, don't bother. He will just make your issues worse that will send you into a tailspin.