I'm so glad you saw the yellow jackets too! Last summer I wasn't so lucky. Their hive was in a hole in the ground under the edge of a shrub I was cutting back. I got attacked and stung numerous times. Luckily I was wearing thick pants and a hat, but I still got tagged pretty good.
So after I called someone to kill them, I thought they were all gone. Nope! There was a second hive under the pile of cut branches. I found that out the hard way! For the second time in a week, I was swarmed and stung several times. I even had them in my hair and got stung on the scalp and hairline. Once again, I was lucky I wore thick pants...
Luckily I'm not allergic to their venom. I washed every sting with alcohol after it happened and immediately changed my clothes. I then applied some baking soda paste (water and baking soda mixed together) to every sting and applied ice after and took some benadryl. I had no swelling and there really wasn't much pain. The itching that came later was nasty. I felt like a dog with fleas.