WD40
Ok, I will shared my best kept secret, spray the sting with WD40. No joke. Everytime I get stung I immediately spray the sting and the pain goes away in 5-10 seconds and the swelling is gone with in 5 minutes. Literally all the pain is gone, it's the wierdest thing. After 5 minutes after spraying it you will be asking your self, wheres the bite because all signs are completely gone. I have never tried it 2 hours after a sting but I have done it 40 minutes after and it still worked it just took a few extra doses of WD40. Go figure.
My 2 year old got stung last year and he was wailing up a storm and I sprayed the sting and he quit crying within 10 seconds and was playing again 5 minutes later.