Thank you, thank you, thank you everyone for posting, I experience this when manic, and I get spooked and go from happy and productive to paranoid and having anxiety attacks. I can be doing ok, ratchet jaw talkiing someones ear off, and something happens to trigger my fear and I instantly am in hell. While I can trigger into the dark side quickly, I have a very hard time going back to happy and productive. I sometimes have to ride out the rest of the episode till I flip back to come down from the fear.