I agree, I'm afraid it's one of those times you'll have to try to tough it out and distract yourself until you get the definitive result. One high result can come up as a result of all sorts of things that are not diabetes, and no change of treatment should ever be based on a single test result, you need to get it repeated. Even though your doctor has prescribed you any medication you are on, do make sure to remind them when you go for your test, and also mention any supplements or over the counter medications you are using, or anything from Family Planning for example which is not on your GPs own prescription pad. All of these kinds of things can affect your result.
On the other hand what I would say is that you won't do yourself any harm by researching so that if the diagnosis does come you are ready with your questions. You may as well change your diet towards the sort of changes you'd need to make as a diabetic because if you aren't diabetic they will do you no harm, and if your diet is very unhealthy then a change to a healthier diet will help you diabetic or not. If you turn out not to be diabetic at this stage you may still be pre-diabetic and the changes could delay or prevent altogether the appearance of full diabetes.
So try not to freak out, wait and see, but be prepared.