The best thing I did or what I found the most helpful was a type of mindfullness they did in the hospital one time. They'd just put this CD on and we'd sit in the lounge room. I was very skeptical at first but all the voice did was to say to listen to the sounds around us - there wasn't any focusing on your breath or the air going in through your nostrils - just listen to the sounds in the hallway etc.
I found it really relaxed me - even just after doing it a few times.
The other one was to try and bring the pain down one time after I'd had a tooth out - even with a lot of codeine it still hurt like hell. I used this guy on Youtube and I reckon it brought the pain down from about an 8 to about a 2. So I was very grateful for that video.