New beek with dumb question.

Yesterday I got my fourth bee sting. I'm in my 50s and have never been allergic to anything. This sting site has puffed up my arm for about 6 inches and itches like hell.

That's the background now the question. It seems that I'm getting more sensitive to each sting (over about a month and half). What do I need to do to de-synthesize myself?