Try a chiropractor or physiotherapist,as it may be a nerve compression from the spine.
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If you have been to a neurologist—then nerve conduction studies must have been done—if not get them done. There are many causes of nerve disorder causing pins and needles paresthesia including diabetes, hypothyroidism, chronic involvement of liver or kidney, chronic alcohol use etc. Hypoparathyroidism too should be looked into apart from hypothyroidism. Neck strain, spondylotic changes in cervical vertebrae, bone disease or bad posture should be looked into. Nerve infections as in Lyme’s disease and nerve disorder such as Multiple sclerosis too should be investigated. I would suggest you get the blood levels of the following checked if they have not already been checked: potassium, calcium, sodium, magnesium, vitamin B complex, or vitamins B1, B3, or B6 and Vitamin D. Get your kidney function, parathyroid gland function and adrenal function tests done because these affect the electrolyte balance in the body. Stress, alcohol, caffeine and fatigue all cause similar symptoms.
Since I cannot examine you and know other related conditions you may be having, nor is a detailed history possible on net, I have listed the various possibilities that should be looked into. Please consult your PCP for primary examination followed by proper referral.
Thanks for the info. You've given me plenty to follow up on. At least it's something to look into rather than just coping with the pain.
fyi - I do have hypothyroidism and am on medication for it (75 mcg of l-thyroxine daily).