I had heard it was a bad headache, so I also tried weening myself off it with ever smaller scoops of grounds. Still, when I finally quit, it was a much stronger headache than I was anticipating. It really was one of the worst headaches I've had, and it lasted ~two days.

That said, my SO will never let me have caffeine again. My SO says that I am so much nicer to be around and that I sleep much better too.

I don't anticipate going back on the java, my life is much better. But everyone is different!