Suggest Remedies For Pain In Shoulder After An Injury

My left shoulder has been sore on and off since November of 2010. Its been increasingly worse this past month. I started strength training with weights this month. Today, while doing overhead tricep extensions with a 15 lb weight I felt a distinct tearing in my shoulder, followed by an intense burning. I have taken ibuprofren all day and iced with no relief. My shoulder hurts to the touch. I have limited range of motion. I am 25 years old, 5'3'' and weigh 163 lbs. I am physically active every day. I have lost 47 lbs since November of 2011.