ac joint pain need help!

I used to play high school tackle football and injured my ac joint on my right shoulder. After two weeks I decided to keep playing with the pain. It has now been about 2 years and I still have pain. I have tried homeopathic medicines such as arnica and ruta but pain still persists. The symptoms include pain in the joint and muscles connected to the collarbone.On back of the shoulder there is also soreness. The muscle on the latimus dorsi and neck muscles also have a type of 'shocking' pain, its like if little muscle fibers keep breaking and breaking but if I wear a tight shirt it begins to be sore and feel as if it is healing. Most of the pain is muscle related but if I lift anything heavy I feel as the joint moves to the side but comes back in place and then feels sore and begins to repair. I have had an MRI scan and nothing is torn but doctors believe it is muscle related. Wearing tight shirts or taking a hot shower eases the pain a bit. I have tried a lot of methods to fix this problem but still could not. If anyone can assist me, I would appreciate it dearly. Thank you!