If this lasts too long, see your doctor. For now, though, keep drinking those fluids. If you're really concerned with hydration, supplement with pedialyte, gatorade, or some other hydrating drink.
<Edit> The others are right about the diabetes. If the problem persists for to long, do as I mentioned above and see a doc. It could be though, that you are more thirsty because the air where you are is really dry or it is very hot and you're losing liquid through sweat.