For weeks I have been persistently getting this tingly sensation in my upper left back, it started off just once in a while and now I feel it pretty much everytime I put my head down or lean my body slightly forward, 20+ times a day, it's not painful but irritating, sometimes it feels like a tingle like pins and needles other times it feels more like burning.. I have no other problems with my back or pain.. any experience with this here???