Talk to Internal Medicine on Constant Dehydration, Nose Sensitivity, And Head Discomfort Despite Normal Tests

Despite drinking 2–3 liters of water daily and taking multivitamins, I feel constantly dehydrated dry lips, dry mouth, and internal dryness. I also feel extreme sensitivity when I inhale through my nose, as if the air travels sharply through my eyes, forehead, and head. It causes discomfort and mild pain from my nose to my jaw and sometimes to my eyes and head.

I have had CBC, Vitamin D, and TSH tests. Vitamin D was 20.3 ng/ml, and my hemoglobin was 11.4. I often feel weak, gassy, and have indigestion no matter what I eat. Multivitamins don’t seem to help.

Please guide me on what could be causing these symptoms and what further tests or treatment I should consider.