These are awesome suggestionjs and I have used many of them. I guess I'll put my input in. If it is severe all I can do is throw up so I prefer bathroom for obvious reasons. If I feel a panic attack coming on I have written in the back of my note book,

Everything is okay. I am not in any danger. Sometimes I think irrationally so I am going to sit here, relax, and calm down.

I turn to that page and read it over and over again.