Trying to lose anti-depressant weight.?

Alright so I started taking celexa in August ( I weighed 115 ), and I quit taking it a week ago ( I weigh now 150). I got mixed responses from people, some say once you quit the pill, you slowly return to your original weight, and others said this is permanent. Either way I'm ready to diet & exercise to kick this stupid pill in the butt. My question is what will it take to lose about 35 pounds in months. I'm assuming since the weight came on so fast, it should go away somewhat fast also. Help?