For what's probably the first time in years, I didn't feel bad about it. Yeah, it sucked that I had to miss a day, but in the grand scheme of things, it's only one 4-hour shift. Hardly the end of the world, as long as it doesn't become a regular thing. Which it won't. I'm doing the best I can with the diabetes, and I'm gonna have bad days. That's not my fault, and it's nice to actually believe that for once.
I'm counting the task as completed. I know I still have a ways to go, but I didn't feel guilty today, and it's a damn good start.