Here's a great website I found a while back when I was VERY sick and wanted to figure out what I could have contracted before going to a doctor to make sure we'd both cover the right symptoms and consider the same diagnosis'. It's free, you don't have to sign up, you just go to the page and click Start and you choose from a specific interactive list of body parts and symptoms, and it'll come up with a large list of possibilities. They've started to advertise the free service on TV as well, so you might have heard of this:
http://www.webmd.com/Thought self-diagnosis is often not the most reliable thing, it can sure be helpful when you need to look into an injury or any symptoms more. I don't trust doctors completely because there's a lot that have been known to overlook symptoms and not give you a good enough or right treatment, so I figure you could have this at your disposal to seriously contemplate any situations and if you have an injury bad enough requiring a doctor's visit, be able to discuss with them the diagnosis and treatment, rather than just saying "I fell and now I've got pain." Let me know what you guys think! Thanks!