In my case it was not a class one medical (rather the PPL medical) and not diabetes, just a worsening, due to age, of a congenital malformation with secondary effects.
It was suggested to me, to my horror, that if I went to see the right medic, I would get my medical nodded through.
I loved flying, but would not want to be solo, holding a yoke with hands and arms that no longer always respond to control inputs, if you see what I mean.
So I stopped flying.
I keep a little bit in touch through this forum.
It is pleasant, but not quite the same.