The sudden onset of pain in one spot on your back, and the progression of symptoms . . . ask your neuro about transverse myelitis. I have no lesions so far on two sets of MRI's three years apart . . . but I do have progressive symptoms like numbness, spasticity, pain that my neuro attributes to TM.

Transverse myelitis

Your hand symptoms could be early carpal tunnel syndrome, unrelated to MS or TM, but every bit as "fun." I have that too. Oh, and Crohn's too . . . my body just loves inflammation!