I was switched from Celexa 60mg daily to Venlafaxine 150mg daily. The switch was made by my primary care doctor because the Celexa which had previously been increased from 40mg, did not seem to be working any longer. I had been taking it for approximately four years. I am experiencing a lot of dizziness and strange feelings in my head with the Venlafaxine which I have been taking for approximately 6 months. I want to discontinue taking it however, I don't want to go through withdrawals (I've had this experience). Can I go back on an increased dosage of Celexa or similar drug? In the past I have taken Prozac, Lexapro, and Zoloft. What would you recommend?