Well, I think you should go straight to the allergist. You have a history of allergies, if I recall, as do I, and these kinds of things can be scary, in addition to annoying. Sometimes, it's hard to figure out. And, you might have 2 things going on at the same time. The fact that you're having hives right now might be a hint that your body is just in an over-reactive state and hence, you are having allergic reactions to things that might not have caused an issue in the past. I've gone through several episodes of this, although not in a long time.
It's not fun to be worried about having an anaphylactic reaction to something you're not sure about. This is why I think you should go to the allergist first, and let him/her rule out something, before you see a derm.