Two ways to deal with adrenaline: slowing its release and blocking its binding.
You can block its binding using drugs like propranolol, which is a beta blocker.
You can slow its release by sitting still, in a comfortable place, breathing in such a way that your exhalation is longer than your inhalation. Ideally, you make the exhalation as long as you possibly can. Keep that up for 10 minutes.
There are tons of other methods of lowering your physiological arousal:
- Drink some warm milk
- Stretch
- Meditate