How Can Pinched Nerve Be Treated In My Neck ?

Hi, My mri in november of last year did not reveal any pinched nerves in my neck, I am now showing symptoms of a pinched nerve as I am experiencing shocking pains in my right arm. Is it possible for a nerve to get pinched in such a short period of time after my mri or for a disc to herniate? I do have various other problems in my spine that they found, spondylosis , ddd, bulging discs etc etc. only I am now getting worried that it s something more sinister although no sinister pathology was found on my mri. I would really appreciate your advise.