Most schools want you to be up to date on your tetanus before you start, but if you got a tetanus shot in the ER, those don't have the pertussis part, and you wouldn't have had to get the complete booster for school. But at least if it is pertussis, it's just a course of antibiotics and it'll go away, so there's that!

and good! lung infections suck, no matter which part of the lung they're in.