Just once? Thus causeing a set back? I suspect that you've been far more careful than most...given all you've been thru, but it is THE question to be asked.
I too, have been thinking about 'flares' lately? As, some stressors and weather..mainly allergens are at a hi time now. As they were the last time I had a major flare 2 years ago. My own 'flares' simply just 'come on' and get in that swampy cycle no one ever wants to experience!
I''m thinking that my allergies, are now going auto-immune to any degree is scaring me silly. So I keep researching [and, not finding much key to the 'combo'].
Most important I've found, is to just CHILL when things start to crank up and try and get to see the rite docs at the rite times to really MAKE the connections. All, far easier said than DONE! Whew!
Hugs !!!!!!!!! & hope truly! - j