Best of luck to Craig. If you don't know who he is, he's the reason we call(ed) Twitter posts 'tweets' [1] and also wrote perhaps the first pre-SDK iPhone app from the outside [2].
The mundanity of the last paragraph made me smile. That desire to just go back to normal -walking, debugging, comfort- after moments like that is incredibly under-rated.
Methotrexate is such a gnarly drug, my partner was on it for rheumatoid arthritis for a little bit, but the side effects were too awful for her to continue it. Luckily there was alternatives. Didn't know it was used in chemo!
[1] https://furbo.org/2013/06/28/the-origin-of-tweet/
[2] https://furbo.org/2007/08/19/mobiletwitterrific/