I worked with a PT to correctly diagnose where my weakness was and it was in my shoulder--all the muscles that keep the scapula stable. The pain showed up in the front of my shoulder and my inner elbow. I am working to strengthen those muscles. It seems to be helping. I would recommend getting evaluated by a PT who sees athletes.
I have had those problems in the past. I ended up getting physical and occupational therapy to work on reducing, and then eliminating the pain. Also ibuprofen works for me. Since I do not know what is the cause of your pain, I don't know what you what exercises will work for you. You should seek a medical professional to make that determination as they may need to take images of the affected joints in order to make a diagnosis. You would be best to seek out a sports injury doctor for the best outcome. What a sports injury doctor and a general practitioner will order for treatment will be very different.