If you think the scenario below is plausible, it explains your other beliefs:
"Suppose I am crazy, and want to experience pain every time, say, I see a black cat. I don't think that my brain can cause me to have pain for weeks or months at a time, following this random cue. Also, many sufferers report getting the spike the next morning. No matter how much I work myself up, my brain is not complex enough to provide me with a pain (in the same part of my body each time) as I wake up the next day. And yet, this is what most of the people who get spikes experience every time they get a spike."
Do you follow much science, Bill? Have you never heard of Pavlov's theory? There have been many studies done on this, so again, yes, it's very possible for this to happen to someone if their response is conditioned. This is exactly what some people on this forum are doing; they are conditioning themselves to have a negative response to non-threatening sounds.
Classical conditioning (also known as Pavlovian conditioning) is learning through association and was discovered by Pavlov, a Russian physiologist. In simple terms two stimuli are linked together to produce a new learned response in a person or animal.
John Watson proposed that the process of classical conditioning (based on Pavlov's observations) was able to explain all aspects of human psychology.
Everything from speech to emotional responses was simply patterns of stimulus and response.
Saying "all aspects" is going a little far, but we can condition a response to pretty much anything in humans and animals.
I've followed science my whole life, and have always had a really inquisitive mind. I've read more scientific journals then I care to remember, and have watched far too many scientific documentaries. When I was a kid everyone thought I'd either become a research scientist or an astronomer.