Last weekend, Number 1 son started hurting all over, including his chest. Of course, he doesn't ever hurt on weekdays, only the weekend. His body loves going to the ER even if the rest of us don't.
This time, it acted more like the flu than pericarditis, so we treated him with ibuprofen for the fevers and body aches and waited until Monday. This let just enough fluid build up to let them tell that the pericarditis was back, and had probably never gone completely away the last time.
He's back on the colchicine, a steroid, and ibuprofen.