Was this accidental or intentional?
Intentional, but I should've eased into it slow-turkey style instead of stopping cold-turkey. ;-)
I've given up on coffee a couple of times before travel. My method was to figure out when I had my first and last cup of the day and then set up a schedule where my first cup had to be 3 minutes later each day and my last cup had to be 3 minutes earlier. I set up a spreadsheet to show my daily goals and track my progress. It worked well. And it was very nice to wake up in Mongolia and not feel like I needed a cup of coffee.
J-J, I have some glasses I'm supposed to wear for reading / computer work. But I tend to forget until after I already have a headache...
If I have to cut back on caffeine I start a few days earlier and cut to 2/3rds then 1/2 of that and then I'm usually okay. It's been awhile....
I used to drink a 10-cup pot of coffee every morning. Then, during some international travel, I went through caffeine withdrawal that included dry heaves, shaking, fatigue, and just generally feeling like I'd been hit by a truck. Today, I drink one cup of caffeinated coffee in the morning, one cup of decaf when I get to work, and then no more caffeine for the rest of the day. One of my better life changes.
10-cups -- holy cow!!! I have one cup per day, almost always decaf, but I won a pound of full-test coffee at a recent run group raflle, so I had been drinking that for the past month or so. (With several episodes of, "hey, wow, it's 4:00 am!" as a result...)