Hi Maddiemo! I've had attacks of gout a few times, so I know how painful it can be and sympathise with you. As far as I know, it's not specifically linked to diabetes.
You say you think you're pre-diabetic because of the readings you get; just wondering why you're testing if you're not (confirmed) diabetic? What made you think you might be in the first place? If you ARE in doubt, then the glucose test you're going for should confirm one way or another, and an early intervention with a sensible diet change should arrest things hopefully.
Let us know how you get on with the test, then we can give you more dietary advice if you need it.
Good luck!