Stap, Hopefully you do get to talk to a nutritionist. A Diabetic diet isn't simply eliminating sweet stuff and carbs -- but learning how to balance the whole load... But, I suspect your "Usual" of sugared coffee and sweet roll would not be considered balanced. And I was surprised to learn that in terms of diabetes they count milk to be a carb too...
But I DO like that your physician is proceeding cautiously and waiting for more tests before making decisions. She sounds like a physician you can have confidence in...
And, it seems to me that you have been complaining of missing your usual strength and energy -- and that could definitely be the diabetes... (Or was it simply the change in routine to the gym?)