Nerve tingling and pain in my upper back, Please Help

Hi,

I have constant nerve tingling and annoying pain in my upper back near my right shoulder along a band extending from my spine to my shoulder. I have seen a doctor regarding the problem although she was unable to provide a satisfactory diagnosis of the problem. I have had this problem for about six months now and can’t seem to find any reason for this. I was diagnosed with Costochondritis (from pain im my right side ribs) about a year ago and the pain has mostly gone away. I am pointing this out because I don’t know if it may be linked. As well, I am taking Nexium (a drug for acid reflux) and have seen articles that say this may lead to a B12 deficiency, but again I don’t know if this is relevant.

I can provide further information if needed.