Unfortunately, it is impossible to provide a specific diagnosis over the Internet. There are multiple possible causes of irregular or missed menstrual periods, and so I really cannot provide much specific advice about this in your case, given the informaiton that you have provided. Likewise, breast pain can have several different causes (although breast cancer only very rarely causes breast pain, and even a large cancer in one breast cannot cause pain in both breasts). Generalized breast tenderness involving both breasts is most often caused by changes in the levels of female sex hormones during the menstrual cycle.

Assuming that you are not pregnant, you appear to have had an irregular menstrual cycle, and most of the time, this is not a serious health problem (a woman's menstrual cycle can become irregular, or missed, due to many different causes, including other illnesses, medications, weight loss, increased stress levels and, of course, pregnancy).

If your periods do not return to your normal, regular cycle, then you should follow up with your primary physician or gynecologist. Finally, as an Oncologist, it would be irresponsible of me not to remind you that smoking is the #1 cause of preventable death. I hope that you will give up smoking as a strategy to proteect your health!

Sincerely / Robert A. Wascher, MD, FACS