Sitting in a corner and crying after a day like that sounds as likely to help as anything else. Somewhere I read that crying stimulates the immune system. Don't know if it's true, but hey, it couldn't hurt.

I've been on those antibiotics. What helped me was to take a good probiotic midway between each two doses of antibiotic. If I'm on the 12-hour version, I take the probiotic every 4 hours. It doesn't completely prevent the side effects, but it helps. There's at least a few hours during which my gut has somewhat more normal biota than it otherwise would.

May things be much, much better tomorrow!