I started taking Zoloft about a week ago, and for the first few days I took 12.5mg, and after I began to take 25mg. The first few days I was fine, had no side effects whatsoever, but when I began to take the 25mg I started to have very rapid heartbeat, and even woke up in the middle of the night because of it, and I was even more anxious. I went to my psychiatrist today who told me to go completely off of it, and now she wants to put me on Celexia. I was wondering since I had issues with Zoloft that maybe I might have issues with all SSRI's or do they all differ for everyone? Anyone else have these experiences?