I used to drink a lot of coffee and Pepsi. About 25 years ago I went on a trip with my wife and in laws. About 3 days into the trip I got a terrible head ache. I tried everything and nothing helped. We went to the grocery store and for some reason I was craving Pepsi. I bought a two liter bottle took it home and drank nearly all of it. The headache went away. They used caffeine free coffee and didn’t drink soda. I was going through serious caffeine withdrawal. I’d never experienced it so it didn’t occur to me that it could cause the headaches. I eventually weened myself off of soda of any kind due to kidney stones (that was 20 years ago and haven’t had a kidney stone since). I drink a lot less coffee now but stay aware of the coffee I do drink.
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