Help Lose weight and tighten stomach

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Seriously I am so disgusted with how I look I could cry. I'm like 200 pounds the heaviest I've ever been. I'm usually around 160. After having my one year old I never got rid of the weight. My 2 year old was a 26 weeker born via emergency c section with a 5 month nicu stay so the stress of going through that I got really skinny and I never gained weight when pregnant with her. Then I had my one year old also via c section and my stomach has been fat and flabby since having her. It just sucks, I'm so disappointed with how my body looks. What things have you don't to help you lose weight? Workouts? Diets? Beachbody? Weight watchers ive thought of doing but I've never done it before and kind of confused on how you do it? What have you done or currently doing that's working for you? And this double chin I've developed makes me so self conscious 😕