jesus that sounds like it hurts. i remember asking one of my sempai what to do when you get hit or get thrown, breathe in or out or hold it, and him hitting and throwing me until i figured out which one was better. ahhh, home.
gleason sensei has really interesting things to say about breathing. he talks about receiving the attack with your breath before you recieve it with you body; that when uke comes in to attack, you should breathe him up into your nose and capture his ki. sounds weird and pseudo-mystical, and indeed gleason sensei is both of those things, but it's also quite interesting and apt.