I am so glad I read this thread. I have a nearly 3week old and this sounds exactly like us. My let down is painful feels like burning/prickly sensation. DS's poo's are green and he feeds constantly! Every 1-2hrs. I am definitely going to try block feeding to see if that helps. He also spews alot and has had a couple of power chucks. He's gained lots of weight though so the spew is not a problem. Im gonna read up some more on it!