There is something wrong with my boobs

R

My boob size was 38D then gotten to 40GG suddenly, I don’t breast feed or have children, I have gotten fatter due to an ED but getting that fixed by dieting and going to the gym, but why does my boobs feel hard, bigger and painful?

Do I have breast cancer? I did a breast exam by myself and there is nothing expect red colour in my boobs? I need help…