Haven't read the entire thread but I have been on champixx twice and its the best thing since sliced cheese. Without it I would probably still be smoking, the cold turkey thing never worked for me.
That being said, some people have different reactions to it, the same as ANY other drug. Some people might fine, others not. So clearly it didn't work for you and your body is not happy, it sucks but at least you tried it and you now know.
He didn't know how to take it though, he had also cut down/stopped cigi's prior to using it. If you check his symptoms they can be related going cold turkey as well.
I have been on it for 3 nights now, i take it with a genpain to ensure no headache