But he operated on you for cosmetic surgery and your problem and pain stems from the operation, (and even if not), and cancer was never even a concern, or otherwise he would never have done
the operation
in the first place. Also,
breast cancer does not hurt like you describe your pain.
So, what your doctor needs to do is hear you and then treat the problem by either draining the fluid or removing the cyst just like japdip suggested, and not dismiss you for reasons that are totally irrelevant.