This is Dr. David
I would ask your doctor to test your thyroid hormone levels
and also check your blood pressure and glucose blood levels in the morning to see if they are low
one last test you should take is an AM cortisol level
your blood steroid levels should be highest in the morning and decline as the day goes down
if your adrenal glands are not producing enough steroids for your body, you could be having more fatigue and balance issues in the morning.
let me know if you have questions.