Have been waking up in middle of night with rapid heart beat. i sit up and feel like i will throw up and then i feel faint. has occured 4 times.cause?

Arrhythmia?: Got a funny heart rhythm? See md, get exam, likely a heart monitor. Avoid caffeine, alcohol, heavy late night meals, recreational drugs, energy drinks.

Many --: More common causes related to diet and substance abuse such as caffeine and alcohol and others -- stress and tension is there somewhere? Rarely is a primary arrhythmia of the youth more common if you have congenital or childhood heart disease.