@ZipLine-- You should see your doctor right away simply because if the breast pain cause is an infection, a cyst or a tumor, it needs to diagnosed and treated quickly.
If you find out after a check-up that there is nothing of the kind, then don't worry. I have the similar kind of pain and I'm also in menopause. My gynecologist, who is one of the best doctors I've ever had, told me that even after menopause, the breasts can become tender and painful during what was our menstruation time before.
The body sort of gets used to that routine and despite the fact that menstruation has stopped and hormones have changed, the physical symptoms of menstruation can continue. It sounds bizarre but it's true.