My heart drops suddenly when I sleep.

Hello.

Lately, my heart suddenly drops and pounds while I sleep, so I keep waking up startled.

My heart races as if I'm surprised, even though it's not a surprising situation.

I usually have slight chest pain.

Sometimes I feel my heart pounding, and I'm worried about what might happen.

I'm afraid I might suddenly have a heart attack.

I'm planning to visit the hospital tomorrow. Could you tell me what symptoms I have?