Re: Diabetes... and dandruff ??
Sounds like you may have seborrhea, which is a flaky condition that can affect the scalp, the face and the ears. I don't think the diabetes is causal, but rather that it might be coincidental that it got worse after a crisis. Were you hospitalized? And did you go several days without washing your hair? That happened to me, many years ago, and it definitely exacerbated the dandruff condition.
Try using either Selsun Blue or T-gel shampoo on your scalp (or another tar-type shampoo), and there's a bar called "Z-Bar" that you can get at the pharmacy (they may have to order it) that you can use on your face.