you are in menopausal stage and also done hysterectomy and thyroid issues as well- so because of hormonal fluctuations chances are there for not loosing weight. knee & lower back problems you will get relief once u loose weight. But still can follow these tips to loose weight. Plan your meals for the week. Manage your time wisely- Eat on proper timings Cut Back on Sugars and Starches-Cut the carbs, lower your insulin and you will start to eat less calories automatically and without hunger. Eat Protein, Fat and Vegetables- Protein Sources: chicken,Fish and Seafood – Salmon,Eggs Low-Carb Vegetables: Broccoli Cauliflower Spinach Kale Brussels Sprouts Cabbage Swiss Chard Lettuce Cucumber Celery Eat 2-3 meals per day. If you find yourself hungry in the afternoon, add a 4th meal. Drink water a half hour before meals. Eat mostly whole, unprocessed foods. Base most of your diet on whole foods. They are healthier, more filling and much less likely to cause overeating. cardio workouts work too.