Six months after going off zoloft and still overweight?

Hi,
I've been doing searches on the internet and found a few topics related to zoloft and weight gain on this message board. I was wondering if anyone had any input on my situation. I weaned off zoloft last October. I went on it for post partum depression. I am still approximately 10-12 pounds overweight. It seems like my metabolism has been altered or is it possible it's just age? I'm 33. It seems like no matter what I do I can't seem to get this weight off. I could fit into my pre-pregnancy jeans last summer, but gradually put on weight while on the zoloft and still can't fit into them now. I'm just looking for any kind of advice or hope that with time my body will get back to normal. I don't feel comfortable in my own skin and definitely don't feel comfortable in my clothes. I'm wearing sweats a lot and when I do wear pants they're tight. I keep refusing to buy new clothes because I think I'll get the weight off, but it doesn't seem to be happening.
By the way, since November I've been going to a personal trainer who weighs me and checks my fat percentage. Both continued to go up. They seem to possibly be stabilizing now, but the weight is definitely not coming off like it should.
Thanks!

The age thing makes a huge difference I'm also a Weight Watchers gal lost 45 pounds on it during college and when the weight starts up 'm back on it again but excercise is more important weight is just a number being in shape is what really matters.