Ooooh, I loooooooooved Ativan. Haven't had it in awhile, but loved it when I did. I also took it "as needed" instead of on a regular basis. It works SUPER-quickly, even faster than Xanax, I think, which tends to just knock me out instead of truly calming the panic. Very powerful stuff, so yes, be careful, but I would support having some on hand "just in case."
Good luck!
Candy