I also get the hoarseness as a mild anaphylactic reaction to, e.g., insect bites or stings. As far as the hives go, do they just appear or do they seem to stem from a specific cause? I ask because I'm allergic to sulfa, and if I'm accidentally given any I get horrible hives all over my body. I know a lot of FMS sufferers are given Celebrex, but aren't told that it's a sulfonamide (i.e., sulfa-based).
Do you take anything for your allergies? The only thing that seems to work consistently for me is a daily combination of Nasonex and Zyrtec (which, without health insurance, I'm not taking at the moment.