I may have peyrinies plague... ive noticed that my penis starts to curve/bend and that it hurts bending it down, what should i do to stop it?

See your doctor: Some degree of mild curvature is normal. In Peyronie's disease, the curve becomes significant enough to cause pain with erections, sex, or (in severe cases), touching it at all. There are medical and surgical treatments for this condition. A thorough physical examination is necessary, first, to establish whether this is Peyronie's disease or not. Please make an appointment and see a doctor.