I myself was addicted to coffee (Sounds like I'm in a support group) but really didn't know it until I switched to a stronger coffee (french roast) made with the french press. Let me tell you, I got so much caffeine I'm sure I was intoxicated from it, even though it was soo good. My quality of life went down drastically, I would experience anxiety and nervousness from it. It took me about 6 months to make the connection that it was the coffee (dur!). So at that point I went to the drip style coffee and went half decaf and half regular for a while, still was occasionally feeling the symptoms, so I went to all decaf. I can still amazingly feel the caffeine after two large cups of coffee in the morning just from decaf, but my body accepts it better.
I'm guessing I raised my levels of caffeine so much that my body didn't like it, now I can't even drink a soda without feeling the same old stuff that made me quit.
So, I guess I'm not upset that I had to give it up because decaf is my savior because I like the taste of coffee too. And when it comes to soda I just drink the pure zero, which is a good alternative.