A few years ago, I got tricked by Folger's when they packaged a decaf product in a red can (traditionally, red is their color for regular coffee, and the green is for decaf). So for a few days I had been unknowingly drinking nothing but decaf . . and having constant terrible unexplained headaches! One morning I did a double-take, and was surprised to see on the red coffee can a little green box describing the 'decaf' coffee within. That explained my headaches: caffeine withdrawal. I didn't want to have an addiction! To get rid of the headaches I started making coffee 50% decaf 50% reg. After 2 weeks 75% decaf 25% reg. Eventually I cut the regular out completely, and now just drink decaf all day.
The best and most noticeable change of getting off caffeine is the morning fog is gone, and I feel good when I get up. There is no need for anything to wake me up, or get me going. I get to sleep fine, unless a life worry is weighing heavy on my mind.