I'm so sorry you are scared right now! I just had a breast scare myself and know how nerve-wracking it can be! Have you been to the doctor yet? If not, get to the ob-gyn right away! Like RubyPitbull said, that is a great place to start. If you don't feel like the doctor has given you enough attention or they tell you "wait and see", then make an appointment with another doctor. The doctor is your employee and should answer any questions you have and do the tests you feel are necessary.
Contact the American Cancer Society for info about breast cancer. I am going to look around online and see if I can find some breast cancer information for you and some good websites.
Remember that there are benign causes for this too. Anytime there is a breast change, it should be addressed promptly. But in the meantime while you are waiting on test and such, try to stay calm. Remember that not every woman with a bleeding nipple has breast cancer. Just try to stay busy and keep your mind off it while you wait on test results. Sometimes the waiting is the hardest part.
A friend of mine, who has breast cancer, told me about a website that she really likes. It is
http://community.breastcancer.net
There is information, links to breast cancer sites, explanations about tests, surgery, and treatments, as well as a forum where you can talk to other women who are going through the same thing. They have a forum called 'not diagnosed but worried' which is a great place to go to talk about the tests, fear, etc.
Let me get back to you with some info. Good luck, take deep breaths, drink plenty of water and try to stay calm. I'm thinking of you and hope that you are ok. Let us know what you find out! And I'm on this site a lot if you need to talk while you are waiting.