Sounds like you may be going through withdrawal symptoms.
I know Klonopin is a potent SSRI affecting the central nervous system. I believe Vistaril is a non-barbituate or something. It works on the sympathetic system. Anyway, they have different functions and the Klonopin could definitely be causing withdrawals.
Even the Wellbutrin is a dopamine reuptake inhibitor while the Effexor is a SNRI. That could cause withdrawals, too.
That's some serious med changes. Let us know if time is helping you any. I'm surprised you weren't weened off any of the meds first.