I Am A 35 Yr Old Female. I Also Javent

I am a 35 yr old female. I also javent had my peroid in over three yrs whoch my dr said wasnt something they were concerned about. My ? Is over past cple days just one of my breasts have been sore, on the inside of the breast that almost feels like it cld be my rib but this evening i cant even touch it it hurts so bad and i alsoxhave pain in my nipple and jus wanna talk with a qualified person a see what cld be the cause and what i shld do to nake it stop