How many is many? Itching sounds like an allergic reaction to me and I'd be reaching for an antihistamine (I've a niece with these kinds of allergies). I don't know of any natural antihistamines, but hopefully someone else here does.
I got stung over 36 hours ago so have had all the stuff they give you at ED and I'm taking extra antihistamines too. 60+ stings all head neck and shoulders and some very sore muscles where they got stuck right into them. I just hoped for something topical to stop the itching?