Girls, can there be any proven safe for baby means to reduce lactation…

Girls, can there be any proven safe for baby means to reduce lactation? We've been in the maternity ward for 4 days, there's so much milk, my breast is very painful and stony, I can't fully express it physically, there's a constant flow of milk, the baby eats a little bit still, but all the time I'm just trying to express it, with a breast pump it takes forever, it's impossible in my hands, while I'm squeezing one, the other is already stone and leaking, what can I do??? Help!!! The pain is terrible, I can only sleep on my back now.