Speaking from experience,
I was really big into caffeine tablets for a pre-workout. I would consume two tablets... (400mg caffeine) in the morning and sometimes even another 200 in the afternoon, even a Red Bull on top of that... It definitely heightens your awareness and definitely makes you feel keyed up for a while, caffeine is the human's natural chill pill. Being an already anxious person as you are, consuming energy drinks, especially those including an "energy blend" can account for up to 1,200 mg in stimulated ingredients. This can definitely heighten your threshold of anxiety, kicking it way up there.
Not that I'm condoning that you shouldn't drink energy drinks, (because I love em, I'm not gonna lie.) just be aware that it can play a huge role in your perspective and your anxiety. I mean it's not a bad thing, but to keep you from panicking out, just keep that in mind that you are under a more anxious state of mind.
I consumed 2 ephedra extract pills, 2.5 scoops (limit to 1 scoop) of a concentrated pre-workout (with a lot of caffeine in it) on an empty stomach and went to the gym before work. I had an AMAZING workout. I didn't realize it until about 2:30pm that I hadn't eaten anything all day and my vision was really weird... I was ansty as hell and felt something was wrong... I looked at my hands and I was trembling. Paranoia set in, and I smoked a cigarette (back when I used to smoke) and it heightened my nerves even higher in the heart rate catagory, I honestly thought I was going to kill over.
I remember customers placing orders (I worked in a deli at a grocery store) and I couldn't relay anything they were saying, or staying focused, all the noises and everything around me were making me super paranoid.
I got sent home (not in trouble) because I told them what happened and I was EXTREMELY pale...
I remember I skipped going home and went straight to my parents house where I layed on the couch for hours trying to overcome what I was going through... I remembered having my dad go and pick up two big macs and two large fries and I ate all of it, trying to for some reason bring me down from it with food tiredness.
It was freaky, I wanted to go get my stomach pumped. Paranoia to the MAX.