Keep schtum, it will only raise questions and you don't need the selection process to be any more stressful or drawn out than it already is. For what it's worth, I developed my "summer cold" one summer a few years ago, having been in the RAF for several years. It doesn't stop me doing my job, the offices and cockpits I work in are air conditioned. Deployed field ops might be a pain in the arse, and I'd suspect some of our rotary crews have issues with pollen. The bottom line though is that once in, you become an expensive asset which can be treated with drugs to control the symptoms. I think you can call it what it is now, rather than a "summer cold".