what do you look up for images of people having a panic attack.
I don't know but would be curious as to why you want them?
There is no real single type of panic attack, everone reacts in a different way and this can also depend upon what it is that is causing them to panic.
You may find this link useful:
http://www.steadyhealth.com/articles/Panicattacksandanxietya236_f0.html
try google or photobucket searches