I thought Ice cold water was helping, it was until it warmed up and the pain kicked in with a vengeance. I didn't sleep and couldn't do anything without cold water In my mouth. My face felt freezing cold. I figured that was adding to it by freezing the nerve and making my gums shrink and exposing more nerves. So I started to warm my teeth back up by holding warm water in my mouth (Swearjng is allowed at this point!), increasing the temperature each time. I'm not going to lie I nearly passed out from the pain, but after doing it for 5 minutes it had reduced to a dull throb, I slept my first night out of 3 too!
So cold water isn't that great! You get stuck in a viscous circle, I drank so much water I puked.