In the UK, (and Europe I think) you cannot fly or be an ATCO if you have type 1 diabetes regardless of what medication you take, or type 2 which is insulin controlled.
(It is permissable under certain circumstances to be operational with type 2 if the condition is tablet controlled).
Very frustrating, but I am afraid that Type 1 Diatbetes usually signifies the end of flying or controlling at the sharp end. It doesn't preclude you from being a ground based instructor or other similar avaition jobs though.
Good luck.