I came off Celexa approximately 2 months ago. I too had weight gain, although mine was about 20-25 pounds during the 3 years I took it.
I am now starting to notice a slow shift in the weight. I weigh myself about 1 time per week at work, and it took until about 1 week ago to see a loss of about 2 pounds. Not much, but it is a start.
If you've only recently stopped the Celexa, I wouldn't be so hard on yourself if you don't see rapid weight loss. As with anything, it will take time. I figure it this way, it took me 3 years to gain the weight now it is going to take a bit to get it off. I'm not saying you're not, but get up & get active. Anything that promotes weight loss or a healthy lifestyle is a great image booster
If you have access to a gym that would be a bonus, if not walk, walk and then walk some more. I love walking, it is completely low impact, but it works