Pardon the posting time -- I have major insomnia! It's really hot, and we don't have an air conditioner in here yet.
I second what nelie said, particularly about the food. I am going through something very similar. I joined the gym about 3 months ago, and have lost a little bit of weight -- about 13 pounds -- but it's definitely not just "falling off" like I imagined.
Based on my personal experience (and having read many of these threads now), I am going to guess that the issue is with your calorie intake, unless there's a something medical going on. When I started, I wasn't losing at all, but I wasn't making any nutritional changes. Once I started watching my food intake much more carefully -- voila -- results. I have been somewhat frustrated/discouraged to learn that the gym seems to be only ~30% responsible for whether I lose weight or not... everything else is what I put in my mouth.
Although it can be a pain to track calories, I would definitely suggest using FitDay (
www.fitday.com). It's free, and even if you use it only for a few days, it helps to see how much food really "costs" in terms of calories. I know I was shocked -- things like cream in coffee and sugary iced tea really add up! I think before I thought of them as "freebies" as they weren't really "food."
Give it a shot and see what you think. In the meantime, are there any positive results other than what you see on the scale that you've achieved from going to the gym? I know the *shape* of my body has changed a bit based on the new muscle. I'm a HECK of a lot healthier, too. The first day I started, I could do the elliptical for only 6 minutes, and now I can go for 45, and my heart rate has gone wayyyy down.
Also - a trainer gave me a "freebie tip" and mentioned that I mix up what I do for cardio. He mentioned I should try the stairmaster, so I added that for 5 minutes at first, now 10. It did help to "bump up" my results a little bit.
If you do these things and still feel like you're not losing weight, I would definitely suggest going to the doctor. There may be insulin issues or something else that could effect what your optimal diet may be.
Hope this helps! Feel free to PM me if you want to talk. I KNOW this is a frustrating process!!!
Jennifer