Some similarities to yours, Mithrandylan.
While in coma my mind—or what was left of my mind at that time—was trying to make sense of the things that I later learned were happening to my body. For example, to assist my oxygenation I was "proned" (bolted to a ferris-like wheel and rotated) while on a trachesostomy tube and ventilator. I was told I was quite feverish. While that was going on I had a never-ending nightmare of being staked out unable to cry out for help, all four limbs tied under a merciless sun cooking me voiceless.
You can imagine then—I'd rather not describe—the nightmares that accompanied the worse medical procedures.
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Mark, I am very curious about this. My coma happened almost fifteen years ago but I probably remember the hallucinations I mentioned more vividly than anything else that occurred fifteen years ago. I have never had the opportunity to meet anyone else who was in a coma, nevermind another Catholic. Coma raises very interesting questions about consciousness and vitality. At least once you're far enough from the trauma of it all.
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When you speak of nightmares, do you mean images/sequences that occurred (or that you are sure, rightly or wrongly)
while you were in coma? Or is it possible that you were awake (however limited your perceptive and cognitive powers might have been)? Obviously I understand that in answering the question you are merely relying on memory, as I am in my own recollection of what I went through.