Acne? How do i get rid of it?

Ive never been one to break out, just here and there, veryyyyy rare, but recently I have been having break outs and OMG they get really red and huge, hurt, its gross, scarring my skin, making me self concious. Ive gone to see a dermatologist and have been using the medication, it helps somewhat but im still having the break outs. I cant use to many over the counter things, my skin is very sensitive. Anybody know what i can do to make them go away or help with the severity of them. One quick note, i noticed they started getting really bad when i started dieting and exercising more....soooo..ummm...idk what it is...hope someone can help..