pumping pain?

i have a medela pump n style, i’ve been using it for 3 months exclusively pumping 12 times a day. i started nursing after my son got his tongue tie fixed and my right boob/ nipple HURTS, like i screamed halfway through and ripped the bra off. i’ve never felt pain like this! its not red, swollen or anything no blood. my flanges are right and i just replaced all the parts, my suction is turned to medium or low sometimes. idk what to do, it hurts so bad i wanna cry