Hi and welcome to Healthcaremagic. . I understand your concerns and I will try to help you as much as I can. Initial treatment of shoulder tendinitis in your case should involvemanaging pain and swelling to promote healing. This can be done by: 1. avoiding activities that cause pain 2. applying cold packs to your shoulder three to four times per day t3. aking nonsteroidal anti-inflammatory drugs (NSAIDs) like ibuprofen and naproxen. Additional treatment may include surgery, steroids of physical theraapy if there was no response on first therapy. LAstly, self-care includes: using good posture while sitting avoiding lifting your arms repetitively over your head taking breaks from repetitive activities avoiding sleeping on the same side every night avoiding carrying a bag on only one shoulder carrying things close to your body I hope I have answered you query. If you have any further questions you can contact us in every time. Kindly regards. Wish you a good health.