I am 46 and recovering from breast cancer (I was diagnosed in March of 09 and had treatment for it for over a year). I don't recall having symptoms like yours prior to being diagnosed. But, I think you definitely have to get this checked out beyond a mammogram. Try to get an MRI done. An MRI would show greater detail. I do not know how implants impact (or if implants do impact) a mammogram. But, it seems to me that if you have been having pain that can not be explained for three months now that you really need to get it checked out. The symptoms you describe do not sound like menopause. Is it possible that your implant could be damaged and leaking?
I think you should definitely pursue this with your doctor and if he does not feel the need to check it out further, then find a doctor who will.
Good luck to you!
Thank you Juju, I appreciate your comments and have decided to go back in to my Dr. and see if I can get an MRI.