Have tried numerous medications at least 15 and nothing works like klonopin (clonazepam) why does itwork so good for my panic anxiety and phobia is it what I need?

Maybe. Although there is research to suggest that chronic benzodiazepine treatment leads to poor outcomes in most situations there are sometimes exceptions to the rule. There may be more medication approaches that have been implemented that would free your reliance on this medication although every situation is unique. I would talk to your prescribing physician about your medications. Stay safe!