I could not get Amelia on the boob, she just wouldn't latch, so I expressed for 3 1/2wks. When I got fed up with that I gradually reduced the number of times I would express. This reduced my milk supply. It is a gradual process. I wouldn't recommend you wait to relieve yourself at the point when your hurting - this could cause blocked milk ducts, creating lumps and could lead to mastitis. Avoid letting the hot water run over your boobs, as this stimulates the milk to be let down. Try applying cold packs for 15-20mins a few times a day. I heard cabbage leaves really work, but I never had to use them.
Good luck.