@techmom,
I'm allergic to mold and have been nearly forever, that is fifty years. It all started when a few things coincided - I had a history class in an old university building (beautiful to look at, good teacher too) and had recently started smoking, soon to be a habit for, uh, the next twenty years. This was around the same time I got my first pair of contact lenses, which I knew even then was irrelevant but added to my misery in being nineteen. It was a sneezerama, at the least.
I saw an allergist at some point and turned out to be allergic to 64 items, though in regular life, some of those haven't bothered me. But mold was one of the biggest offenders in that testing.
Jespah is correct, you should see your doctor, but I will add, I think going directly to an actual allergy specialist would save you time and possibly (who knows) money.