The thing about chronic illness is that it’s CHRONIC. It’s not like a cough where you have to drink plenty of OJ on the weekend and you’re all better.
It’s there with you ever morning and every night for the rest of your life.
My chronic illness is never going away so stop acting all shocked when I have to go lay down from exhaustion, like this shouldn’t happen to me anymore.
I live with an illness for life, try and deal with that fact.
"How’s your [insert disease name] doing, hun?"
"It’s about as consistent as your ability to ask ignorant questions veiled as concern. I’m going to go take a nap now."