Don't worry your not alone. I to suffer from that. Im type 2 controlled by meds and i usually get those symptoms if i have naughtily overindulged on sugar. Usually after a meal out and decided to have a sweet. Its normally accompanied by peeing a lot at night at which i then start to feel like ive been on the beer all night. I lose balance and struggle to focus properly then by the morning i feel like im hungover. When i check my blood in the morning its normally about 12mmol which is not to bad, still high for me. But im told that your body during sleep try's and battles to get your blood sugars right and thats why you feel like crud in a the morning.(don't know if thats wrong or right) but kind of makes sense.
This is all assuming that you have been diagnosed with diabetes...if not,might be worth getting checked. Its one of the main reasons why I decided to see a doctor.