Ask my wife or my mother… or even my college students.
Oh, yes. Definitely. I'm sick right now. It seems like I'm sick twice as many days as I am well. There are days when I believe I am never well.
My colds turn into something worse most of the time. I have chest congestion, and have for months. It started as a cold, became bronchitis, and then a staph infection. Antibiotics and steroids have not cleared my chest. The coughing hurts, the gunk in my throat disgusts me. But, there hasn't been a good solution.
The immune system overreacts to everything. A minor cold? Nope. My body rushes to "help" and ends up making matters worse.
I realize this question was about illnesses, but physically I'm fragile, too. When I have an illness, it makes it harder to ignore the leg, back, shoulder, and neck pains. I was in a back brace for scoliosis and there are some permanent issues with my spine, which leads to pain in my limbs.
So, yes, I am sick often and it magnifies my "autistic" traits. Coughing with a bad back hurts. A lot. Sensory overload is a constant state of existence, and being ill only makes it harder to tolerate sounds, lights, and touch.
Maybe this isn't comforting for parents, but I am only one person. I don't know if others have similar experiences.