Mujitsu and Tairaku's Shakuhachi BBQ

I don't know what it is, but I do know what you mean.  I once had a job interview in such a room.  I guess the room was designed so no outside noise would interrupt the people inside, but I found all the same symptoms you described.  Add to this the fact that you are naturally somewhat stressed becuase you are in an interview, and the whole effect seems ten times worse.  It was a nightmare, and I found it very hard to concentrate.  I actually ended up getting that job, and had to go back to the same room a couple more times.  What a torture.

John Cage had the same experience. He heard two kinds of sounds, one high and one low. The engineer correctly identified the lower one as his circulation, but was probably off the mark thinking the high one was Cage's nervous system.

It was a decisive moment for Cage, as he realised there's no such thing as silence for human beings.

When you play music, notes in silence are really notes introduced into this subtle sound environment - like shapes painted on a background, which have space between them, but never empty space.

Or something.

I had a rebirthing experinece... I was sitting in a tee-pee in a bathing suit on top of a layer of mud and ice offset by large hot rocks in a pit. I'm pretty sure I developed a mild form of pneumonia though... so blood pressure aside, it was pretty wheezy for a couple weeks.