My arms swelled up, really poofy, can barely feel my elbow bone (technical term). Started at triceps and traveled down. Right arm is swollen through mid-forearm, left arm is just the triceps area. Left my house at 7pm, went to 2 different clinics before being sent to ER, finally got home around 1230am. And they don't know what it is. They prescribed me Motrin They're still swollen today, and sort of firmer. It's gross, tight, and uncomfortable.
Seriously though, I hope the swelling goes down, that can't be comfortable at all and that you get some answers for what's going on. I'm glad it's not immediately life threatening though.