Having discomforting chest sensations when I lay down and attempt to sleep.  It stops me from sleeping and have been awake all night for the past 3 nights, until I can pass out tired and sleep til noon.  I went to ER a few days ago during the night when I experienced extreme panic about the heart sensations.  ER said heart palpitations and numbness in my skin was caused by hyperventilation.  Since then Ive controlled my panic breathing so I havent hyperventilated again.   But I cant see a cardiologist til monday and Im scared every night, like now, when I try to go to sleep and feel my heart rate changing and feeling weird sensations in chest.
Yes panic attacks can cause palpitations. However we must also rule out organic causes. As in if there really is a heart rhythm disturbance. I suggest you an ECG and 24 holder monitoring. life-threatening palpitations are those which lead to syncope or fainting spells. U should also check your thyroid function tests. Thank you.