Over the counter Benadryl will lessen the over sensitization of your skin from all the wasp venom.

When I was a teenager I participate in the activity of technical rock climbing, we'd take weekend trips to "The Gunks" in the Shawnagunk Ridge near New Paltz, New York.

Back in those days there were no manufactured climbing harnesses you used a length of 1" wide flat nylon, the loop was positioned so that it went around your waist and between your legs, you clipped it together using a locking carabineer. Your climbing rope used a knotted loop at its end that was also clipped to that locking biner when you were on belay.

Climbing a moderate 5. something route of 3 or 4 pitches total maybe 100 feet vertically, get started up the first pitch setting protection every 8-10 feet, three or four points in get to the tiny ledge maybe 30 feet off the deck where a very good solid point can be set with a web runner wrapped around a small stone spire. As I'm get the runner placed around the spire the first sting hits followed shortly by more. MY climbing partner is belaying me and see's what's happening, starts shouting "just fall I've got you! Jump!" I manage to clip my rope into the biner on the runner and just sort of push myself off the rock face. Initial drop was about 5 foot which can be pretty jarring, even though we were using the original Plymouth GoldLine a hard laid braided rope with lots of elongation built into it. The force of the drop nearly upends my belayer yanking him off his feet, after a moment he's able to regain his position and start to try to lower me but this was at the early days of the figure 8 rappel belay devices and we didn't have one but used a plate with a slot to brake the rope as it ran through a biner. Needless to say the descent was a comedy of trying to unjam the belay while not dropping me all the way down as I was tyring to remain upright and defend against more stings.

Got to the deck scrapped and banged up a bit, stung probably 19 times already and the yellow jackets still in hot pursuit! Now the both of us are on the ground being attacked by the swarm, BUT still tied into the cliff belay points with the rope's ends attached to our waists with either a well cinched knot that had to be untied or a locking biner that had to be manipulated open to get free in order to run away! I had the least amount of slack rope and my buddy had already run to the end of the slack and was feverously trying to separate himself from the rope, every time either of us moved very much it yanked the other guy around who was also trying to get separated from the rope which held us in the yellow jacket cloud! It was like a comedic scene from a Road Runner cartoon!

Finally got free and ran probably a 1/4 mile to get away from the swarm, left the rope hanging and our protections in place until we went back a day later at night and recovered the rope and most of the protection I'd placed, I said screw the last sling runner at the top near the nest.

Ended up getting stung about thirty times, got a box of baking soda at the nearby general store to work into a paste to put on the stings, so that really helped the reaction to them.

On a side note on that trip I met Bill Shockley who had a place near the Gunks where he began going to climb when he worked at Bell Labs, spent dozens of weekends camped in his back yard on subsequent climbing forays. Great climber, gracious host and Nobel Prize recipient for his part in the invention of the semi-conductor transistor. Very interestingly his analysis was influential if not instrumental in the decision by Truman to use of nuclear weapons on Japan rather than trying to defeat them with non-nuclear tactics and the corresponding loss of Allied lives.

Needless to say after that attack by the yellow jackets I often spent an inordinate amount of time scanning and watching for any flying insects near any climb I was involved in if there was a chance of wasp friendly conditions!