Unfortunately we can't go back and change things, but I'm guessing you will be sure to mask up next time. There are multiple threads here on BYC's about this. Many of us always wear masks while doing the clean out especially those of us with impaired lungs. Anywhere chickens hang out for any amount of time, there will be dust. Poop, dander, casings, etc will be in their area, especially in their coop. Histoplasmosis can be serious so anytime dust might fly, it'd be a good to wear a N95 respirator. I wish you the best and hope nothing comes of this but in the small chance it does, please see your doctor as soon as you notice symptoms. The severity between cases is all over the place. I know that
@Folly's place was one that participated in a similar thread that I recall. She always has very wise advice