Over producing

Anyone have tips to help prevent overproduction? My LO is 7 weeks. If she goes longer then 3hrs, I get extremely engourged, to the point it's painful. At night I feel like I have to pump after each feed because of how engourged they get. I know pumping more frequently makes it worse, but it's to painful to sleep. The time she eats has dramatically decreased as well (from 30-40 mins to 15-20mins). She is gaining weight, so I'm not concerned about that. I know your body is supposed to adjust, but mine doesn't seem to be!