Breast congestion can be caused by padded bras. Excess clothing on the trunk, and not enough on the extremities, is a significant cause of female problems of various types. Drink enough water, so it is easier for the blood and lymphatic system to care for the milk glands. Regularly take B vitamins, vitamin C, calcium, and magnesium. These vitamins help regulate the production of prostaglandin E, which in turn slows down prolactin activity.
Prolactin activates breast tissue.
Do not use diuretic drugs. Instead, drink more water to help improve kidney function. Do not use highly salted foods. Some find that applying cold water to the breasts helps when they are painful. But others find that alternating very warm and cold works better.