The Macmillan site is a general site about cancer, but they do have a section about breast cancer. They also have booklets you can download about cancer.
http://www.macmillan.org.uk/Cancerinformation/Cancertypes/Breast/Breastcancer.aspx is the link to the breast cancer section and here is the link to a PDF about breast cancer that you can download:
So sorry to hear you are in the waiting room. I can't comment on your situation, but will give you a word of advice. Please DO NOT GOOGLE!! Now you have found this site, stick to it and the Macmillan site.
I know it is a worrying time, but when you have had your tests on Wednesday, and got the results (probably one week later if positive, maybe sooner if negative) you will feel more in control. Please let us know how you got on.
Sending hugs and best wishes