Well done. Identify change in behavior, examine for cause, recognize problem, notify parents, manage issue. Nothing else you can (or should) do.
Any kid that you care for you should know a little about, like is he/she allergic to anything before giving a medication. A lukewarm to slightly cool bath can help a fever too, never, ever use an alcohol rub. Kids can tolerate very high temps pretty well with no lasting damage, but over 101.5 the pediatricxian should usually be notified and 104 or greater deserves an immediate trip to the doc, or even the ER if the pediatricain is not available. The younger the child, the less the wiggle room on the doctor visit.
Don't rely on an ear temp for accurate measurement, they can be off by 2 degrees or more, especially if the kid has an ear infection.
DONT PANIC, NO MATTER WHAT. That will only make the situation worse, and don't ever forget, that if you are in over your head, and are starting to lose it, call 9-1-1.
Hope the teeth are feeling better BTW.
Fish