Yeah, that definitely sounds like astral projection.
The growling sound could have been the famous vibrations disguised. Sometimes, we perceive things in strange ways when they are unfamiliar to us. When you separate from your body, your consciousness changes frequency from the physical world to the astral world. While separation is in progress, you are between frequencies, which is very similar to being between two radio stations, that is -- you get static or vibrations, or in your case a strange growling noise.
I've experienced the tingling prickly feeling too -- kind of feels like your physical body when you've slept on an arm, depriving it of blood.
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