Loyal to program and not losing weight

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I have been so committed to Fitness Pal since August 20 and have not lost any weight. I am over 50 and fairly inactive due to severe chronic pain from mostly orthopedic problems. Have done treadmill and it causes more pain but keep on trying. I am waiting to find out if I need to increase my thyroid meds. I feel like I just can't win. My Dr. is very happy I am doing the program and told me his wife is doing it to. I need some support.