...and the walls came tumbling down
It seems that Castaneda had a similar episode to mine. In The Eagles Gift he writes:
...I had a sense of mild discomfort which I explained
away as a dizziness or a sudden loss of breath due to physical exertion.it
reached a climax one night when I woke up terrified, unable to breathe.
The physician I went to see diagnosed my trouble as hyperventilation,
most likely caused by tension...