Suggest Treatment For Pain On Shoulder

Dear doctor! I have this pain on my lelf shoulder for few years. I have been complain to my doctor and he send me to physio. But does not help much. I got this pain from work due to heavy lifting and it seem to get worse. The pain is on going one day very painful other day is better. Pain like lots of bug moving and sometime feel like a pulse ticking and burn. I just got the image done and it s show I have tendonities. Is there any thing I could do? Do I need to do any MRI?