Constriction: listener observation

Super on edge today.  I feel like my mind is in overdrive and am trying to concentrate on the physical sensation.  I've been reading the book you mentioned on the Sunday podcast 'conversations on non-duality' and I keep seeing the word 'constriction'.  That very much feels like the physical sensation I keep getting in waves.  I have a thought, immediately followed by a sensation which I just try to 'be with/experience without judgement'.  It will dissipate, then some time afterwards it will come again.  It's like it's a thought that is really fighting to be responded to or fixed. It feels hugely unpleasant but I'm trying to just be aware of what the sensation is rather than trying to do anything about it.