Hot fermentation and shoulder rotation exercise  with  correct posture

Your upper back pain could be due to nerve compression or cervical spondylosis or muscle spasm. You should give hot water fomentation for your back twice a day for 15-20 minutes. You can use Volini gel or spray provided you are not allergic. You should do upper back and neck stretching and strengthening exercises with proper guidance.

It could be disc bulge compressing the nerve to upper limb. Manual therapist can align the disc back to it's normal place. Good luck.

Looks like a nerve in neck might be getting pain which is giving pain upper back and hand

Consulting is best to give good solutions. 

Hi. Do hot water fomentation to neck and  upper back 2-3 times a day Avoid too much use lap top, mobiles .

It could just be a muscle spasm because of the work you are doing. Apply hot water bag or heating pad to the area for 10-15 mins followed by stretching and basic neck and shoulder movements. Try and palpate yourself and see if the pain is radiating to other points like the base of the head or towards lower back. In case that happens just press that specific point with the end of a pen/pencil for 20 seconds and release it. Repeat this 4-5 times for relief. Hope this helps