I have MCTD and all my EMG tests are negative, but I still have pain. Apparently, one's muscles tense up, causing the pain in the area. Tendons get annoyed, too. Request images and a referral to PT. You should improve your sitting ergonomics and there are exercises to stretch/loosen muscle tightness/strengthen your shoulders and from there, the pain should drop off. Magnesium, hydration, ice/heat, CBD ointment and periodic movement can make a real difference. Dr Jo is quite good, but skip the first exercise. https://www.google.com/search?q=dr+jo+10+rotator+cuff+exercises&oq=dr+jo+rotato&aqs=edge.3.0i512j69i57j0i512j0i22i30j69i64.6531j0j1&sourceid=chrome&ie=UTF-8#kpvalbx=_pfjlYZC9CfPJkPIPpbK0UA25