so i was getting ready to go to the gym, i took my pre-workout drink, got in the car and BAM. got a phone call saying i had to be back in the office to listen in on a conference call that starts in a half hour. im wired and annoyed now. so now im a situation here. how long do i have to wait before i can take another one? do i even need to take another one? did i just waste my once-a-day drink? its gonna be a few hours before i can leave again.