Have you tried low-carbing and measuring blood sugar for some or all meals in a day? Might be useful for you to know these blood sugar values before you see your GP, but first phone your GP to see if he/she agrees.
Low-carbing:
no rice, potatoes, pasta, bread, most fruits and vegetables,
sweet drinks, juices, beer
allowing:
celeriac mash/chips, cauliflower rice,
raspberries, strawberries,
avocado, broccoli, brussel sprouts, cabbage,
lettuce, cucumber, small amount tomatoes
typical day menu(for me):
Breakfast:
sausages/bacon, poached/boiled eggs, cheese slice(s)
Morning snack: Coffee with teaspoon(s) double cream
Lunch:
omelette with vegetable or
2 quarter pounders (e.g. Angus) with cheese topping
Afternoon snack:
coffee with double cream or
full fat Greek yogurt with raspberries
Dinner:
Meat/Fish, celeriac mash/cauliflower-rice, broccoli
Before low-carbing my blood sugars were in the range 11-15mmol/L for rice potatoes and pasta. After keto low-carbing the values after all meals have been 5.9-7.6mmol/L.