I have had several joint replacements, which can be quite disabling while healing, and now have CHF, which on a day when I am retaining fluid can make it hard to breath, so I have a handicapped hang-sign in my car but I never use it unless I really need it that day as I understand how it feels to need it and have them u available.
In fact I needed the handicap toilet the other day (i take strong diuretics for the CHF) and it was in use......and out pops a 19-ish year old girl...literally bouncing out. She will think twice next time I think......

Good read. I live with one of the biggest invisible illnesses, Type 1 Diabetes. There is not a waking moment of my life that I'm not reminded of what I'm dealing with constantly. Despite that, back in December 2020 I learned a lesson the hard way.

Went over to my mother's one day after work in order to shovel out her parking space, and afterwards came inside to lay down on the couch for awhile. Only trouble was, I didn't get back up... had suffered an apparent critical low blood sugar, the kind that would have turned lethal if no action was taken. My mother had a stash of Junior Mints nearby, and started shoving them in my mouth, and it took nearly an hour and a half before I came around enough to test my own blood glucose. Even after all of that, my blood sugar was only 42, still seriously low. Almost had a trip to the hospital over that one. That incident reminded me of my limitations now.

Yes this is wonderful. I have heard this before and it always resonates.