hello I have been suffering from pins & needles, burning sensation and itchiness for about 2 to3 years now Ive had an MRI scan on my head and lower back.. about 2 years ago,, case was all clear ive had a nerve damaged exam about 2 years ago... case was all clear Had another MRI scan on my head a few weeks ago.. case is clear ive been to chiro for 4 months and still have not helped what could this be? places I feel are on both feet and lower legs, both hands and lower arms,, my left side of the face,,