I have always taken some type of benzodiazepine for the anxiety-- I have anxiety problems aside from BPD so just like all meds along with personality disorders, it's just treating a symtpom. Right now I take Klonopin for anxiety/agitation. It used to be on an "as needed" basis, but my pdoc recently instructed me to take it everyday, morning and night, along with my other psych meds. As far as the paranoia, I don't know if you mean psychotic paranoia, or anxious paranoia. I experience paranoia in the sense that I KNOW what I am thinking is irrational and not true-- therefore it is not a form of psychosis, rather a lesser anxiety. The as needed meds do not help with this. I find them to be helpful with acute anxiety, but as far as general anxiety and agitation, they are not great for that.