Only thing I could really consider myself "allergic" to is dust, and even then I'm not entirely sure about that. I haven't really noticed it acting up in recent times, even when I do have a lot of dust around. It used to bother me so so much though. Sneezing fits, watery eyes, sometimes coughing if it was bad enough.
There was also a point in time when I became similarly intolerant to cat dander (it made for some interesting times when I came back home to my parents' four cats), but that disappeared once I was able to be around cats again for a bit. Go figure.