I didn't quit cold turkey, switched to low caffeine white tea for the first week (still got the headaches, grrrrr), and then the 2nd week, when the headaches grew less, switched to the herbal stuff, and headaches started right back up (grrrrrr).
Now starting 3rd week and I think I am falling asleep easier.
I didn't eliminate foods that contain caffeine because I am not that crazy but mostly because I didn't want to search out food that contain (or don't contain) caffeine.
Wonder if me getting older has decreased my ability to process caffeine, though it is plausible my current mindstate has rendered me less able to deal with the effects of caffeine.
Oh well, life goes on either way.