This is caffeine acting on brain and unlikely any change in blood pressure per se. You can try measuring bp a few time before and after chugging red bull to see how much it changes.
Man, very true. I used to be totally in the zone after a coffee, because I rarely drank it, but I hated the physical nerviness that came with it. Bizarre mixture of mental calm and physical anxiety.
I remember one time I randomly had a really bad reaction to caffeine. Normally I have no real physical reaction to caffeine, but this time my body went crazy, hands shaking, dry mouth, I was kinda panicking honestly.
It made me completely bomb a game of tf2 6v6 and my maincaller got really mad at me :c