Great news, It can be debilitating though, and recurring. Son had it first year of high school and was off a full term. I at the same time had another similar one Barmah Forrest.
Aces and pains, tiredness, all that crap. After a few return bouts for a few years we are both ok though I did have a low RA factor for a few years too affecting my hands. I suggest google to get more up to date with it as ours were about 16 years ago.
It is hard to find anyone here without it in their blood (they tried to do a study but could not find enough people without it) many have no symptoms, many are only slight whilst to some it can be crippling for a while.