It does sound nasty.
I’ve been stung several times, once when we’d locked ourselves out I was standing on my husband’s shoulders trying to squeeze through a tiny first-floor bathroom window and came face to face with a wasps nest under the gutter. Lucky to get only 5 stings.
Each time I’m stung I get a worse reaction. I carry antihistamines with me and take straight away, they help a lot.
Good luck with yours, hope it calms down soon.