I've had this experience happen during two different ceremonies. Usually a few hours into it, when no music is playing and everyone is quietly lying down. I would hear this buzzing sound that gets louder, almost like an insect of sorts. Accompanied with this breathing sound, like someone is deflating air out from bellows. There is a feeling of decay and death around me, like the air is getting heavy and that time is slowing down. I'm not having any visuals along with this, just the sounds, feelings and not being in control of my body and limbs.
I get the sense that something have approached, and is working on me. I tried searching for others having similar experiences but couldn't find anything.
What could this be? Has anyone felt anything similar?