I was watching a video and it was telling about he characteristics of multiple personalities.  While it was interesting in most aspects the one that was glossed over but most interesting was the statement that each personality could have different allergies.

 As a younger man I suffered interminable allergies during July and August.  This was in my late 20's and on through my 40's.  Then my doctor put me on some medications for colitis and the allergies retreated. 

The weird thing was while combining I once hit a pile of something that created a blast of dust, exploding towards the cab.  Before it ever could have gotten into the air system I started sneezing.  My severe allergies started with some events that were emotionally damaging.  As life has progressed I'm still allergic to some things but nowhere near the degree and severity nor the range.