In the end I went to the show.  I'd been in bed for almost forty hours straight and I'd about had it.  I got through the show fine - after, I said I thought having food poisoning may have been preferable to seeing the show.  After, I went out with a few folks and I was weak that I decided to chance food, so I had a cup of soup and a sandwich.  So far it's okay, but do pray for Rosemary's Baby.  Notes to write.