Sadly I doubt your Gp has ever met anyone with type3c, nor your surgery nurse…mine hadn’t a clue, neither had hospital after twice being sent to A&E by Gp with ketoacidosis. But that was 10 years ago, so things might have moved on in the NHS! You might find getting a free continuous blood glucose sensor from Abbott (Freestyle Libre 2) which you wear for 2 weeks ( assuming you have a compatible mobile phone to scan/ record), that would show whether your BG is doing something odd at night eg hypo .low blood sugar, or glucose dump making BG high…which might be giving you night sweats.