I don't know that I've been in a comp when I was ill. I did a comp once when my ankle wasn't right. After the comp, it felt better.
Maybe you could set up a foot-care business? Just do two rounds of QS and you will feel a lot better
Well, I think I've told you the story before about how I used to have serious problems with plantar facitis before I started dancing. Since I've been dancing, my feet are a lot stronger, and I've had no foot problems. (Other than an oddball case of gout, which was quickly solved once I figured out what was causing it.) BOT... if I had something like the flu, I'd still try to go and compete, but if I couldn't do everything, I'd probably scratch some of my smooth heats first. Those are the ones that I find require the most strength and are most exacting about balance. I can fake my way through rhythm with less-than-perfect strength or balance.