Dear SallyBrown, It may be that the lymph node showing up now may be positioning or possibly a change in your overall breast density that this is now visible - it is hard to say. Having another mammogram or ultrasound would not change what this is. If you are concerned about the interpretation of the results having a second opinion from another radiologist is always an option for you.
Breast pain is a common breast symptom. The reason for breast pain is not clearly understood, and is not usually associated with breast cancer. Breast pain is sometimes associated with hormonal variations and is then called cyclical breast pain. Noncyclical breast pain does not seem to be linked to hormonal variations and is often localized to one area of the breast tissue. Noncyclical breast pain may or may not be the result of an injury to the breast.
Breast pain is evaluated based on the history of the pain you would give to the health care professional, as well as a physical examination. The need for further testing would be determined based on the above findings.