Thanks for the sympathy & advice, Roberta, mac & Mame.
I didn't have any meat tenderizer in the house (I've never used it) but found some tooth paste with baking soda & applied a bit of that. Soothing.
BUT the swelling & redness have remained pretty much the same . It feels a little like an ear infection, though I don't know how it possibly could be.

In fact, my ear feels like some sort of weird foreign body! There should have been some improvement by now, surely?
I think I'll visit my doctor tomorrow if there's no improvement by the morning.
What a drag.