I was off Nuvigil for a while. I believe I had started to develop serotonin syndrome so I stopped taking Nuvigil while I weened off of my SSRI. My SSRI was only 10 mg so I took 5mg for a week and then stopped taking it two or three days ago. Today I took half of a 250mg Nuvigil/armodafinil and I'm having heart palpitations again! I've also got diarrhea, muscle spasms, frequent urination, fatigue, and confusion. Help!