My 7 week old has gone off feeding the last couple of days. I admittedly have a very over active letdown which I am managing by block feeding and expressing a little before he feeds as well as nursing lying down. He still chokes, splutteres and takes in a lot of air despite my efforts and it seems to unsettle him so much that he gives up and doesn't want to nurse anymore. Even when there is no more string letdown he still coughs and splutters. He's clearly hungry but because it obviously causes him pain he doesn't want to feed. It's really stressing me out. What more can I do to help him?