Sit or lie down and rest
Take slow, deep breaths
Inhale through the nose for 4 seconds
Exhale slowly for 6 to 8 seconds
Avoid caffeine, nicotine, and energy drinks
Drink water if you may be dehydrated
Loosen tight clothing
Try gentle vagal maneuvers only if you have been taught to do them by a clinician
Avoid sudden standing or intense activity
Manage stress with calm breathing or meditation
Get enough sleep
Seek urgent medical help if you have chest pain, fainting, severe shortness of breath, or a very fast heartbeat that does not slow down