Yeah, you probably are mostly feeling the effect of no caffeine more than the sugar, but both can leave you feeling like a drug addict.
Lots of people go through this, especially low carbers. One issue that affects people when cutting carbs, is that it has a diuretic effect. This coupled with you not drinking all that pop, can cause dehydration, which can cause headaches, and lack of energy for a few days to several weeks.
Make sure you replace all that pop with water. Maybe drink 10-12 glasses a day, plus another glass for every 20 minutes of exercise. Other than that, it is just the caffeine and sugar, and it will take a little while for your body to get used to you not ingesting these.
If it gets any worse, or you think it isn't from this dietary change, then see a doctor.
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