dehydration
bladder infection
toxemia - food poisoning, heavy metals
side effects - new meds/supplements (Rx/OTC), dosage changes
hypoglycemia
anemia
postural hypotension
inner ear/sinus - infection, Meniere's Disease
The list goes on and on ...
Though it may take awhile, they can usually figure it out. The good news is that you can probably rule out pregnancy and Bieber Fever! Good luck.
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