having tapered off benzos before, you could also just be in tolerance withdrawal, and esp if you take varying amounts of klonopin. I went through massive panic attacks after being on same dose for many years, and then duplicated that during a gentle long taper from the drugs, so I know what interdose, or tolerance withdrawal feels like when on Klonopin. I also found that taking certain supplements can trigger panic esp when in tolerance withdrawal on the klonopin. Also, it could be die-off for sure. A combination probably.