Shoulder pain

Hello, I've had this shoulder problem now for two weeks. It started the Monday after my first swim meet, it was fine Saturday and Sunday. Whenever I touched the area it hurt it was to painful to bare, lifting my arm was to painful to bare. I went to practice Monday and when I first started swimming, the pain was unbearable, but after a 100meter of free it was fine. Later that night I couldn't hold my arm up longer than 5 seconds. Every time I swim, it goes from not pain the to a lot of pain. It hurts when I lay on my left arm, I can't sleep at night because of it. Its swollen a bit at the top, side, and back of my shoulder. At first I thought it was just a regular not stretching enough pain, but the next day I stretched over and over again and it just keeps getting worse. If tried six different pain and swelling meds, and four other methods, I've used swelling and pain pills that were giving to me for an ankle problem, ibuprofen, Advil, Motrin 800 milligrams and flexeral, napersern nothing helped the pain never left, I've tried icing it, heating it, strengthening it, stretching it, and nothing helped!!! I'm not sure if I want to go to the doctor yet, what do you think is going on and what should I do????