I have never heard of headaches caused by carbon rising-I'd love to hear more about that, what and why if you have the info. Sounds interesting.
I always assumed my TERRIBLE headaches were from all my coughing and whiplashing my head from sneezes and hard coughs.
But yes, I have awful daily headaches and now it sucks b/c I don't want to take any painkillers now that i'm prego-I know you can take some but its just a personal choice.