I have it too.
My head/neck and shoulder jerking is one motor tic that accompanies me on and off and in alterations for years now.
I do feel something akin to a chill preceding it. (Didn't as a kid.)
This sensory tic precedes my motor tics and the one often preceding head/shoulder jerks is so... prominent?
When it isn't there (or I just fail to notice when distracted), I have much less control over how the tic shows and when it's real strong, I'll just tic right away because it's beyond my influence.
It totally reminds me of a chill running down my spin but it is different. A chill from cold is different.
I had the sensory tic/chill-like-thing yesterday evening and had real chills from the cold. Way different. A chill (the real one) is also more uncomfortable to me. I felt so cold for just walking outside a minute or so, winter's so on the way (where's my summer gone to?).
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Autism + ADHD
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The trouble with having an open mind, of course, is that people will insist on coming along and trying to put things in it. Terry Pratchett