As far as i know anyone who is insulin dependent cannot get a class I medical and although I'm not completely sure I think a class II is out of the question as well. A LAPL might be achievable in those European countries that do not require an EASA medical for it.
Took me three months to get my medical back when I was diagnosed with diabetes and the main part of it was proving that I cannot go into hypoglycemia, even with a doubled dose of my meds (metformin), without eating and very heavy exercise. And even so I now have quite a lot restrictions on both my license and medical.