How often should I get checked for diabetes?

Softy asked:


I was wondering how often i should get checked for diabetes because both my dad and my grandma have it. I know that i am at risk because it runs on my dads side of the family.I also get dizzy when I stand up. And I am a teen that does do sports. I am not overweight.
When i do get dizzy i feel like i am about to faint and if i eat something it helps.