If your breasts have been swollen and painful for ten days and you have not had your period, you should first rule out the possibility of pregnancy if you have a normal sexual life and do not use contraception. This is because if you are pregnant, your breasts will be mildly swollen and painful under the effect of estrogen, and your breasts will increase in size, and your areolas and nipples will appear colored. So first collect morning urine and use it to do an early pregnancy test to see if you are pregnant. If you are not pregnant, the painful swelling of the breasts is caused by the relatively high secretion of estrogen and low secretion of progesterone in the body. In this case, it is recommended to take progesterone orally to promote menstruation, and if you are not planning to get pregnant, you can also take prozac orally.