Answer
It sounds like you do not take antihistamine on a regular basis but only when you experience symptoms. In this case I would recommend Benadryl as it is a recommended drug for this. Personally, I carry the children's chewables with me just in case I eat something I shouldn't. The chewables can be taken anywhere anytime without water. They don't taste bad either. You need to double the dose for adults. They only problem is that it can cause drowsiness. Benadryl also makes a cream for hives.