The bright side! I'm pretty sure we narrowed down the cause (my new lavender bodywash) and treatment is easy (chuck it in favor of something non-scented and pop benadryl like candy)
I took a hilarious misstep at 3am when I woke up to a rash under my arms and thought, "maybe it's my deodorant? I'd better wash that area (with the bodywash that was actually the culprit)"
It all worked out, tho! Got a steroid shot and the urgent care I went to was thankfully like, "stay out of our waiting room, we'll call YOU when you can come". Which is definitely a point in its favor.
Haha, yes! Bless the lady who took my stats at the beginning. She asked if I'd changed detergent or soaps and I said, "Well, I started a new lavender body wash but that was a couple of days ago..." and she gave me a Look and said, "oh yeah, lavender is Like That"
Googled it while waiting for the doc and it was like "damn, she's right! it all fits!!"