Yes I have this (to a degree) too.

I always go to work (call me Mr Reliable). But once I am there - I often find myself freaking out over nothing..... I will flee to the bathroom and hide in a stall until I am calm again.

Just yesterday I was in a meeting with three other people and I had a bit of a panic attack. I could not focus, I could not process anything that was being said and I soooooo wanted to flee - but I knew I couldn't. Not fun.

Sorry, I know that I did not offer any "help" to you. Just know that you are not alone on your troubles. Best wishes to you.