Moocow
Semantic Nitpicker
If you were feeling anxious and had a high caffeine intake then it was probably the caffeine causing it. Since I stopped drinking coffee and tea I've began noticing just how much of an impact caffeine really did have on me when I did drink it a lot. Even now, just one cup of coffee may help me study or get work done, but not without unnecessary, and even seemingly inappropriate feelings of anxiety. I would classify the feeling as ambiguous dread.
So it's possible that your strange feelings are actually drug induced as well.
So it's possible that your strange feelings are actually drug induced as well.