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This is Dr. David
I am sorry you are having these issues.
WBC count of 15.8 is not normal. this can be a sign of infection or inflammation in your body.
weight loss can be from hyperthyroidism or autoimmune disease or inflammatory bowel disease.
you could be having hot flashes and sweats from menopause and declines of your estrogen levels.
have you had your blood estrogen and FSH and LH levels checked? are you after menopause?
you need a colonoscopy and upper endoscopy to check your bowels and stomach as well.
have you had ESR, ANA, levels checked?
have you had thyroid hormone levels checked?