Thanks for all the good advice and recommendations.
The swelling is subsiding, but it had advanced to about midway up my forearm. From one side, I looked a little like Popeye, yesterday.
Itching is all but gone. Hand still looks like it's been on a Krispy-Kreeme diet. At least I can make a "fat boy's" fist now.
Last time I was stung by anything like this was when I was about 6. I was playing at a neighbor's house, inside, when a big hornet-thingy decided to pay particular attention to me. I took off running, slamming the screendoor behind me. Unfortunately, it caught up with me about halfway home and stung me in the back of the head. It actually knocked me down.
At least this time I didn't start bawling for my mommy.
I was able to exact some revenge, though. Went to Homer's a bought a can of wasp spray and nailed the crap outta that nest.
I know it's foolishness to feel satisfaction about killing a load of insects that were just doing what thier nature requires them to do.
But, oh it felt good!
