Swollen breasts = stretch marks during period?

Hannah

My periods have gradually been getting worse (more nauseous, more painful, etc.) over the past year or so. This past week, my boobs got so swollen that I couldn't lay down without them hurting. If I bent over, they hurt. They got so swollen that I now have stretch marks! After one week on my period! I am only 25, what the heck is going on? Am I alone in this?