Muscle pain. Long will it take to heal!

One month back while working in the kitchen I was scrubbing I felt slight pain on my shoulder back which got increased like the pain you feel when you play badminton or something after long time . Then it became severe the pain I felt was between spine and shoulder blade then two week later it got radiatete towards hand then I got tested n all my vitamin d was low 7.3 and b12 was 201 . After that doctor suggested me to stop working for few weeks and put hot fermentation at back. After three weeks of vitamin d the pain. Got little better after from the fourth week I don't see much improvement if I don't do any work then the pain is normal but if I do even typing on laptop with correct posture strt feeling more pain . How long will it take to heal