Neck and upper back pain since 8 months.

I have got myofascial pain syndrome last year while I started working out in a gym. I had no rest due to stressful lifestyle but I still continued gyming due to which I had developed muscle knots in my upper back and neck. In September the pain became unbearable and I was diagnosed this condition and was told my muscles have become weak and there are knots. I have gone through multiple physiotherapy sessions and mild exercising but the pain does not seem to be cured. Some days the pain gets too intense and it has affected my normal lifestyle. I have taken multiple tests for RA factor and C Reactive protein which came out negative. Also I had gone through X-ray and MRI which did not show any damage. I do not know what should I do to get normal like how I was earlier. Please help.