I don't drink coffee or tea, but I usually drink caffeinated soda with food. I visited another country a few years back where soda isn't usually drank except in special occasions like at parties. I couldn't figure out why I had such a bad headache for the first few days. I thought the caffeine content from soda would be low enough that I wouldn't have withdrawals. Finally on about day 5 I decided to have tea with my breakfast, and no headache that day. That was when I realized what a caffeine withdrawal headache felt like, and I finally realized why I get headaches if I don't have lunch at my regular time (when I usually have my soda).

I really wish I could get caffeine free cola, because I don't even want the caffeine. I just want the cola flavor. But it seems the only caffeine free cola that is sold in stores is also diet, which I don't like the taste of. They sell caffeine free, non-diet cola online, but at absurd prices.