calorie burning elliptical workouts

What causes me me not to lose weight?
I know that I burn more calories than I take in every day. Metabolism Base: approximately 235 lbs = Calories -2200 physical demanding job: I wear a pedometer and the average 15,000 step burn calories at least -1000 workout on elliptical for 500 calories or more per day in 2200 BMR-1000-work 500 – Total Daily Workout to burn at least 3700 calories that I eat between 1500 and 2500 calories daily, even If I cheat I know I do not eat more than 3700 and when I eat something I should not eat I put in some extra training time. I know I should have around 1,000 daily calorie deficit which means that I should fall around 2 pounds per week. My problem is that I lose nothing. Why? I almost reached the conclusion that I may have a thyroid problem which has little weight 60 LB The gain in less than a year. I'm not really ready to accept that.
You may not want to accept it, but you may not have a choice. go to your doctors and get tested that way you can eliminate this possibility. Also, if a thyroid problem maybe they can give you medication to help you make control. Its your health, and yes we are talking about the thyroid can be a serious problem, not just make you gain weight. Good luck ……
Metabolism and Calorie Burning