Poor thing looked like there was a chew in there!
Tell Hubby to quit spraying the nests during the day. You really should spray them at night so that most (if not all) of the wasps will be in the nest when he sprays.
While the say that only honey bees leave the sting, I think it may be possible for them to hybridize with wasps or something... DD was out picking choke cherries some years ago and had the dog with her when she disturbed a nest... big paper nest like hornets and aerial yellow jackets make. They looked like yellow jackets, but I removed several stings from both her and the dog.
For anyone getting stung, do not pull the stings with your fingers or tweezers. You need to scrape it off with something like your thumbnail or the edge of a knife. If you try to pull it off, the venom sac is still attached and you will squeeze more venom in.