We and the doctors are rather apt to put everything and anything down to A.S. especially with your family history. Alright it may well be A.S. but now is not the time to panic.
I assume you can have bowel problems with or without A.S. but best check this with the professionals.
I have several different NSAIDs. over the years and found that most took about a week to start working.
You are very right to try to get the inflammation down A.S.A.P.
I take it your boy is to attend regular rheumatology out patient appointments. It is important that he does as the A.S. may well go in to remission only to return latter so you don't want to loose touch with the rheumatologists.
