Went off Celexa now weight gain

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It took me a good month to get off Celexa. I never loss any weight on it. I usually maintained around 117. Now that I've been off for 6 weeks the pounds are coming on quick. I gained 4 pounds in less then a week while counting calories. I'm still counting calories. I looked it up online and this is a side effect. Anyone have this happen? Did the weight come off after your metabolism adjusted?