A simple blood test can tell you if you are diabetic.
Itching has many causes, from external to internal. Have you changed laundry soaps or personal soaps lately? Have you started a new medication lately - itching is a common and temporary response to new medications.
Also, if your sleep is being interrupted for other reasons, you may need the toilet because you've been awakened - like we do first thing in the morning when our sleep hasn't been interrupted.
Just a couple of things to think about.