I know that I have mentioned the work of Jerome Kagen previously
his ideas have a resonance for myself regarding being a "HSP" and
I was looking for a podcast that I 1st heard him on, it is no longer
available but the transcript is.
http://www.abc.net.au/rn/allinthemind/stories/2006/1722388.htm

This is a short excerpt from the interview about a "reactive/hsp"
person acting preemptively to try to control their environment.

"So they have to be in control, because they have learned over 15 years
that when something unexpected occurs their hearts start to race, they
feel tense and they don't like that feeling. They've got a long psychological
arm out, they take notes, they have rituals in the morning, what they're
going to do today. They protect themselves against surprises that would
give them a moment of tension or uncertainty."