I have never been a huge soda drinker. I have been off and on soda over the years, more often off. However, I have had my runs of soda including starting a couple weeks ago when a friend got me hooked on DP 10 (which is very good for a diet drink, btw). In an effort to get back off starting today, I stared to get the worst headache a couple hours ago. And now the headache is horrible.
What this all tells me is that basically caffeine is a drug. I don't know if this is scientific or anything, but man this is horrible. Remind me to never drink a caffeinated drink ever again.