SUGAR: Its probably the sugar making you feel this way, namely high fructose corn syrup. Foods with high caffeine tend to have very high sugar content as well, mainly high fructose corn syrup. Large quantities of this kind of sugar can lead to diabetes, high blood pressure, obesity, and since your having it before bed, imsomnia, and more. Its mostly the sugar you are 'addicted' to, and its my suggestion that you cut down on the SUGAR.
Its going to feel super crappy, and sad, a kind of detox, when you stop drinking large quantities of sugar because of your bodies reliance on it for the release of dopamine, a nuerotransmitter that releases a feeling of pleasure, so it is very similar to an addiction, but much easier to overcome. I would try to replace soda with a healthier alternative like natural tea, diet soda, or just any sort of drink that does not have high fructose corn syrup.
Feel better soon!
