In all honesty, Xanax. I know, I know, it's additive. When I did have a script I never, ever abused it & I do not have an additive personality. I was actually afraid to take it, & would hold off as long as I could. God, it was a horrible time. Months & months of incessant panic with the occasional break-aways into full-blown panic attacks. As a matter of fact, I still have one left over from years ago, even though it has probably lost all its potency by now, that I'm hanging onto like a security blanket just in case I ever have another one of the big, bad ones in which you would rather be dead than have to live through. I just wish I knew that if I ever should need it again it would be there.