I feel for you. My older son had it when he was at the beginning of eighth grade. He caught it at camp from someone who thought he had bronchitis. It took 3 doctor visits, since he had a history of allergies and asthma everyone thought that was it. Finally, the school nurse diagnosed it. He got it because he only had one dose of the pertussis part of the dpt. The first one caused one of those strange high pitched crying reactions so that was it. I didn't let my other son get that part of the vaccine either. Anyway, he was soooo sick for about 3 weeks, with the constant vomiting from the cough. One morning it was so bad I thought he was going to die in the shower. He felt so sick that he didn't even mind me coming in and seeing him naked! He pretty much looked like death for a couple of months after that and it really ruined his school year.
Rest!