tobaccy mixed with epsons salt works wonders. When young I was highly allergic to bees, wasps, YJs and the like. One honey bee sting on my foot meant walking on crutches for a week or more because my whole leg would swell up pretty big.. I had to take shots to build up my resistance for 4 yrs. I still swell a bit though.
Before the shots, Doc said if I'd been stung by 3 or more I'd been dead before I could be taken to the hospital. I still stay away from stinging insects as much as possible.