Jade, its nothing to worry too much about providing you're sensible.
Its not 'opposite' to Diabeties, its just not as life threatening and can be controlled by diet rather than injections. However, be aware that in some cases, if you dont look after yourself it can develop into Type 2 Diabeties.

Blood tests aren't really very conclusive to diagnose it, you are more likely to be diagnosed through trial and error with side effects & symptoms.
Get yourslef into a routine with eating habits and its amazing what a difference it makes.

There's quite a few of us that suffer from it on here in varying degrees, and there have been some very useful threads in the past so worth doing a quick search on here.