Does anyone know WHY this is? I know the SE's and nervousness and anxiety are usually listed. But WHAT is happening and WHY? You would think you would be more sedated. But I never am...EXCEPT for when I take something new for the first time. But when I was taking Vicodin 4-6 a day after surgeries, I felt fine with all kinds of energy but not nervousness. On this Duragesic patch I feel extremely nervous.