Sit or lie down and rest
Take slow, deep breaths
Avoid caffeine, nicotine, alcohol, and stimulants
Drink water if you may be dehydrated
Cool down if you are overheated
Loosen tight clothing
Try gentle vagal maneuvers only if you have been told they are safe for you
Manage stress and anxiety with relaxation techniques
Get enough sleep
Treat fever, pain, or illness
Take prescribed heart or blood pressure medicines exactly as directed
Seek urgent medical care if you have chest pain, shortness of breath, fainting, severe dizziness, or a very fast heartbeat that does not slow down