A couple of days ago this was posted on this forum

"You are trying to do all the right things, just don't "battle" it out. Try and carry on with normal day to day things and don't shrink from your anxiety. Remember that's it's acceptance that brings recovery. If you've been in a bad place for so long then old habits die hard, but they do die."

An absolutely cracking thing to post.
Ever since then when I've been feeling anxious I try to memorise that quote and say it slowly in my head - I also sing a bit of Bob Marley's Three Little Birds in my head
"Don't worry about a thing,
'Cause every little thing gonna be all right."

That, along with some slow breathing and rational thinking always helps see me through when I feel like that in work (an office environment).
Maybe also some sucking on mints or so plus a little sip of water and distraction is my favoured remedy.