Last night I went to bed, and I started Boxed Nirvana. As the sound played, I started relaxing from my feet up to my face.(I have a problem relaxing my face). So I got these light vibrations after a minute or two.. And I tried to remain calm and not to fall asleep. At one point I sensed these very strong vibrations, and they vanished after a moment. I know these kind of vibrations from before, because some time ago I used to wake up in this strong vibrational state and separation from that state is easy.. But these vibes ended after a second.. So I remained in position. Then I felt swinging. This swinging was very "real", like someone really swigged my body... Then I got excited or afraid (i don't know why would I be afraid when I know that nothing can happen to me..). And my heart started to beat REALLY hard. Like it was going to jump out my chest. I tried to remain calm but this hard beating and swinging (same time) didn't vanish. Then I stopped the attempt. I put my arm to my chest and I really sensed this hard beating, it was physical, not mental. So what caused this very very hard heartbeat? Can I get heart attack?
What do you suggest me?
P.S. I think these hard vibrations occurred when Boxed Nirvana played louder sound, I mean that it louder\higher sound actually induced this vibration.

P.S. I think these hard vibrations occurred when Boxed Nirvana played louder sound, I mean that it louder\higher sound actually induced this vibration.