Please take it easy, Nana Moon. I don't want you to have a permanent seat in the ODIT (Over-Did It) Club headquarters. You know this. You said:
"I have to learn to slow it and take a break between tasks."
Please take this to heart.
I've got to say hearing about the weirdness happening with the sole of your foot got me worried about #CRPS. I don't claim to know anything at all about it, but I once touched the leg of someone who claimed to have it, and the area was shockingly cold. Certainly hoping I'm wrong about all that. #CRPS is a (insert word for a female dog here).
ETA: I wrote that bit about #CRPS just about the same time you were posting about it. Gee, I certainly hope you're able to take this tour of Austria. Have you contacted the tour company to see how it could accommodate you if you're still having good days and and days. I'm sure they've run across people with physical limitations before, and have figure out ways to help them comfortably get the most out of the tours. It always helps me to have something to look forward to, and this sounds like it could be the ticket for you.