My immediate management (ie in the department rather than in the university) are extremely supportive of my diabetes, are always happy for me to take time off/move my hours etc for appointments, and are (almost) overly worried they might be putting too much work on me/stressing me out [they never have, and I have assured them I’d let them know if they were!].
As opposed to my last lot, who insisted on all time out being worked up in advance, and objected to my being ill without notice (? yes, they expected advance warning of being out of the office for _all_ reasons, including emergency medical ones. I didnt last long there.)