Hi Anwen,
Definitely go back and discuss with your doctor. Your BGs are too high for 'normal' and you seem to have some difficulty metabolising the sugar - even after the lucozade, a non-diabetic should mostly regain pre-lucozade figures within 2 hours. (This doesn't mean you're diabetic, but it is not normal).
Ask your doctor for a Glucose Tolerance Test (GTT). You have a fasting blood test and then drink a measured amount of glucose. You wait 2 hours and then they take another blood test. In my opinion, this is the best way of diagnosing diabetes. Two elevated fasting blood tests can diagnose it for some people. An HbA1c can diagnose it for some people. However, I am perfectly capable of having HbA1c in the 'normal' range and having near-normal fasting levels - but I am still diabetic as my body does not produce enough insulin (or any?) after I eat, so my BG can very quickly rise into the 20s - they can also fall back into the 4s over a period of a few hours, so at fasting tests I can look like I'm not diabetic. Random tests can be, well, random :lol: It depends what I ate and when in relation to the blood test - if I'd had a glass of orange juice within the last few hours I'd be in double-figures, if I'd just had a cup of tea and nothing else, I'd probably be in the 4s or 5s.
Go back to your doctor, explain your concerns and ask for a GTT.
Let us know how you get on.
Smidge