It sounds like your do react badly to stings!DH and I both got stung by angry bumblebees last year. Mine hit on the belly, a ways above the navel. It swelled up HUGE, like 6 inches across, and then had a big nasty red welt in the middle of it. It looked like I had a third boob.
They pass over our place when they leave Bosque del Apache. Hundreds of them circle in the sky making their noises. Sometimes they fly high and sometimes low. Always fun to try to spot where they are.