How Can I Take Off My Post-menopause Weight Gain?

I’ve been dieting my whole life and know most of the traditional diet tips. My eating habits are not always the greatest – I nosh “healthy” foods between meals (boredom, emotions) in addition to 3 low fat low carb meals. I count calories and do 1200 on a good day, 1600 on an off day. I exercise fairly regularly 3x weekly walking 1 hour, 2x Pilates and 1x exercise class with weights. I feel good but haven’t been able to take off the middle age “tires”. Last year I managed to take off 10 pounds, but seem to have put them back on again. I feel discouraged and don’t like the way I loook in clothes now. Any ideas?