About 15 years ago I began having severe panic attacks which I started taking Zoloft and klonopin. I took it all that time and it worked, no more attacks. Well I had decided to wean myself off slowly over one and a half years and this month was completely off. I felt bad the first week then felt great the second week. Three days ago they are back just as bad as when they began 15 yrs ago. They start off by an awkward overwhelming feeling of fear then the physical symtoms start. Heart racing lasts even after 2 hrs after taking 0.5 mg klonopin. I started back on Zoloft yesterday taking 50mg. I hope it kicks in soon. Anyone else experience this?