The chest pain mystery was solved yesterday. The pain was an effect of spider venom.
My left torso and back are covered in spider bites. Hundreds. There’s a huge red welt of multiple bites under my left arm, and another smaller one on my left shoulderblade.
I don’t normally squash spiders. I catch them and let them out outside. Well, the next spider I see is going to be ruthlessly squashed. Probably the one after that too. Hey, they made it personal.
And yes, I’m still in slight pain.