Welcome to HCM,
After going through your history,you have pain in neck and back radiating to right fingers, first possibility seems to be radicular pain
due to backbone either cervical spondylosis
or severe muscular spasm.
Other possibility is viral infection or activation like some time herpes? before appearance of blister.
You should see a orthopedic surgeon and after proper examination and X ray cervical spine
and if necessary MRI of spine to confirm the diagnosis.
Once diagnosis is confirmed treatment would involve analgesics,anti inflammatory with muscle relaxants and local ultrasound
,traction and or short wave diathermy.
Because these pain are neuropathic B12 and drugs pain modulators like pregabalin
may be required.
Hope this information helps you to plan your consultation and treatment.
Please take care.
Dr.Akhilesh Dubey M.D.