Suggest Treatment For Pain In Back Of Neck

Dear sir, i feel pain on the back side of my neck and also the upper back muscles...some times it is back muscle spasm since i feel strong pain for a short while and it gets better, but it is about 5 months that i feel a permanant pain on the upper side of my back and it gets worse when i am sleeping. I started doing yoga since i thought it will help me but it is two days the i feel very strong pain in one point of my vertebral(in the upper side of my back)...i will be very please if you guide me on the subject Thank you