I don't often post here, but lurk quite a lot (time...).
The sensation you're experiencing is a parasthesia called formication. It's caused by a number of different things, usually not directly related to diabetes, but could be related to other medication, is be unrelated to current meds. For instance, vitamin B12 deficiency can cause parasthesia, but it's not the only cause!
Best bet is to go to your GP to discuss what is the likely cause
