Hi there
As long as your thyroid levels are where they should be, you can be successful. There are plenty of folks on this site who are hypo and have lost and maintained their loss for years
The key is to find a lifestyle that YOU can live with...as a lifestyle. What works for someone else may not work for you. Why did you gain on Weight Watchers? Could you stick to the program and which program was it? You need to think about how you view food, what is most important to you, then formulate an eating plan taking those factors into account.
For example, if I eat sugar or refined carbs, I want MORE. So for me, a plan based on portion control of those kinds of foods just doesn't work. Sooner or later- usually sooner- I'll binge on them. So for me, the ONLY way of eating that ever resulted in weight loss (and I've maintained both the loss and the way of eating for almost 5 years now) is to pretty much get rid of refined carbohydrates and sugars. I lost most of my weight combining the SugarBusters plan with a lot of exercise and more frequent meals. I also did Body for Life, but the eating isn't much different, just more frequent. Now I eat small, frequent meals of whole grains, lean protein and lots of vegetables. That way I get to eat A LOT, which is what makes me feel like I'm not on a diet for the rest of my life. Others who can control their sugar intake, incorporate a daily dessert in plans like Weight Watchers (points).
There are endless diets out there and 3FC has a forum for a lot of them. Why don't you spend some time reading about the different diets on the forum stickies and think about how you would like to eat.
Exercise- I'm a gym rat. I love it. But you can get a good workout at home with minimal equipment. Take a look at the LWL and Exercise forums. This question has been asked about 4328576 times. Do a search on resistance bands- Meg put together a great total body workout using resistance bands. I just answered a post yesterday, I think, on the exercise forum, asking the same thing.
Motivation isn't something that is going to hit you between the eyes someday. OK, maybe if you were told by your doc to lose weight or you'd be dead in a few months....Seriously, don't wait for motivation. You need to make choices. Every meal, every workout, every offer of food, you need to make a choice and take responsibility for your choices.
Hope that helps,
Mel