Post hysterectomy, weight will surely go up due to hormonal changes that the body undergoes. I would need a detailed diet recall of what you eat from morning to night. Meanwhile to start with work on these few things for sure. First is to eat small meals at regular intervals for better metabolism and secondly to have complex carbohydrates over simple carbohydrates such as bajra Jowar Ragi oats and thirdly add low fat dairy in the diet for protein such as skim curd, skim yoghurt or skim paneer for higher metabolism. Fourthly also add omega 3 fats in terms of flaxseeds powder and walnuts to help a anti inflammatory effects to start seeing fat loss.