Yep most likely anxiety, it could also be the "virus" or whatever it is too.
I asked on another anxiety forum if anyone else gets chills, and it seems like I'm not the only one.
Mine seems to be wind/draft induced. Like any drafty/cold feeling on my neck and my whole body seems to go freezing cold. Like super sensitive to cold/hot or whatever.
It certainly seemed to take my mind off it!
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"You're fine" "There's nothing wrong with you" etc. Same as the doctors I've seen I guess.
Just need to get myself on that team. Hopefully will do soon!