I have been taking Concerta 36mg ER for about 2 weeks. Additionally I was taking Pristiq 50mg for about 2 months. My Doctor took me off of the Pristiq a few days ago. Today I have felt lightheaded and dizzy all day. I took the Concerta 10 1/2 hours ago and I'm still feeling the same. I even feel nauseated from time to time. Am I taking too much Concerta and causing this? Any input would be appreciated.View Thread