I am quite sure, this symptom is from the autonomic nervous system, which sure can be affected with TOS. I have had that symptom years ago, when all my troubles started. It went away after a couble of months.
I have been writing here before, as i have a lot of autonomic symptoms , that i am sure have their course in TOS. I am searching in scientific articles, and have forund proof, that this could be the case, although rare. Not very much research on this. I am trying to get an overview of this in writing, with references an all ( for the purpose of going to a private neuro soon) and i will try to get back to you, when it is more readable.
But be calm, I have had these symptoms for tventy years, learned to live with them in different ways, and not dangerous, i think.