NL,
With the limited information provided, it would be impossible for me to give you a diagnosis. Your symptoms of tingling, burning and mucle cramping should be evaluated by your
primaryPrimary amyloidosis
Primary biliary cirrhosis
Primary hyperparathyroidism
Primary insomnia
Primary lymphoma of the brain care physician, to rule out medical/neurological causes. If no medical/neurological causes are found, your symptoms may be due to an anxiety or
somatoformSomatoform pain disorder disorder, in which case you may find consultation with a mental health professional helpful. Serotonin levels in the body are usually measured indirectly, by obtaining levels of a serotonin metabolite (5-Hydroxyindoleacetic acid, 5-HIAA) in urine or cerebrospinal fluid samples. It is not standard clinical practice to measure serotonin levels, except in research settings. Please refer to our forum archives for more information on anxiety and depression, and discuss your concerns further with your treating physician.