Congrats on stopping smoking thats BRILLIANT. When i took Champix i was told NOT TO have mine after 5pm due to the fact it interferes with bedtime sleep so you have done the right thing by starting to take it earlier. Also they should have told you to take WITH FOOD otherwise it can make you feel sick for hours and i mean that.
I only took champix for 12 days in total and stopped on Day 4 or 5 and now i celebrate 7 months so there is hope for you.
Anyhow good luck with your quit, its good that when even at your parents you dont want to smoke but the headaches are more than likely just your body adjusting to the missing nasty chemicals you used to give it daily and also the extra oxygen your body and esp your brain are now getting which will calm down.
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