I have had this come and go over many years.
Its definately anxiety related as when I am really
calm if I had the symptoms not a few minutes before
they just go.
Things I have found that can increase the feelings
are to much dairy products like milk or cheese. I
also find when I am anxious that I sometimes feel
I have a tiny amount of water sitting at the back of
my throat and this sensation to will go as I become
relaxed once more.
Dont know if any of the above matches with you
but I hope it helps