Another shoulder problem

Unfourtuntly I think I have to join the ranks of the injured shoulders. I have a couple question concerning injuries of shoulders. First, when is a sore shoulder bad enough that you should see a doctor and when is it O.K. just to take a wait and see approach? The other questions is, is there a way to know if it is a rotary cuff problem or maybe just a sore or pulled muscle. My shoulder started bothering me a few weeks ago. I was laying on my couch with my 22 month old, when she decided it would be fun to throw herself at me. She landed on my left shoulder and I felt a sharp pain. My shoulder has not been well since. The pain can sometimes just be a little sore but if I use it the wrong way such as picking up my daughter it can hurt pretty bad. It seems O.K. when I swim freestlye but I can feel more pain doing the other strokes. I have been doing a lot more freestlye because of that. I do have to say I am a little reluctant to go to the doctors in fear that he will say stop swimming. I have only one regular meet left this weekend and our championship next month. Then I can take a long break if I need to. Once the weather gets better I can start running more and I don't have to depend on swimming to keep me in shape and to loose wieght. I guess I am just trying to get through this next month without having to stop swimming and without loosing all that I have worked for this season, right before championships.