In summer, when these things are around, I often ride with my jersey half unzipped. A few times I've gotten a stinging insect caught inside the jersey. That is not good. A female rider with the same issue had to go off somewhere to resolve the problem. I don't react, but Benadryl works for those who aren't outright allergic.
I was on a backpack with my wife when we encountered a hive of ground bees who'd been disturbed by horses who'd just passed us. She got stung 27 times and I 15 (I ran faster). She is allergic but not too badly. Her lower legs swelled up like she had elephantiasis but she was OK. The swelling gradually went down over the next few days. Close one. We always carry Benadryl.
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Results matter