There are actually a number of reasons for frequent urination. An anxiety symptom can even be an increase in voiding, caused by the fight or flight system of the body.
With diabetes, there is an increase in thirst, and this therefore leads to more frequent urination. When you have diabetes, excess sugar builds up in your blood stream. The kidneys are forced to work overtime to filter and absorb the excess sugar. If your kidneys can't keep up, the excess sugar is excreted into your urine along with fluids drawn from your tissues. This creates more frequent urination, which may cause dehydrated. To quench your thirst, you drink more fluids, causing you to urinate more.
So with diabetes, there is a combination of thirst and urination. Basically, your oral intake of fluids, should come close to your output (minus some fluid loss through our respiratory system and skin). This is not just true for a diabetic, but for anyone who drinks a large amount of fluids.
The very best to you, Hypomania!... Chuck