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].
Ah, I feel a kinship.. in 2007 I got an iPhone, followed the guide to install the homebrew SDK on Linux, and managed to get it to work to create iPhone apps. At first they'd run on jailbroken phones (there was a command to "sign" them), later I installed a Hackintosh and XCode and even got the Apple Dev program subscription and sold one app on their store.
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/
Psoriasis, eczema and psoriatic arthritis being three that maybe you wouldn't think of when someone brings up methotrexate.