firemonkey wrote:
...just sat there like a human clam, anxiety and stress levels up several notches
"Human clam" - yes that's exactly me in these kind of situations. I try to make myself smaller and smaller in the vain hope of getting just an inch more breathing space. When I use public transport, which is rare in large part because of this, I sometimes end my journey with cramp, pin-and-needles, a dead limb, etc. from my attempts to shrink away from someone who, perfectly reasonably, had to occupy the seat beside me. Getting "trapped" in a window seat makes me squirm. And when I'm in that tensed up state, speaking or being spoken to can easily push me over the edge into shutting down. I just want to become invisible and slink off.
Hugs can be good with the right person and when I've explicitly invited them into my personal space - but then and only then!
As my username suggests, I used to be a pot-holer/caver/spelunker, and I was forever being asked if it made me claustrophobic. Most of the time, the honest answer would have been; "Not as much as you are."
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When you are fighting an invisible monster, first throw a bucket of paint over it.