Well, first of all, do you have ADHD? It can affect people differently- primarily by doing nothing, helping them focus, or helping them sleep. Secondly, I think a 2L coke would make anyone feel sick due to that much sugary syrup. Even diet coke has a sweetener that would make someone feel sick after 2L of it; it's just not sugar.

Good! I hate caffeine-induced anxiety with a passion. I can never trust regular coffee ordered by anyone else or made by someone unfamiliar. I typically stick to chai or iced tea unless my husband makes coffee in the morning.

Walks definitely help with anxiety. Getting outside to take a deep breath in general typically helps me- regardless of how long I can be out there.

Caffeine gives me anxiety and definitely doesn't wake me up, but I think that's a combination of my anxiety disorder and ADHD.

I hope you've been able to relax and get that caffeine out of your body.