I can' loose weight!

When I met my husband I was weighing 115 I always had a big butt skinny waist and my hair was super long and healthy. I ended up getting pregnant I couldn't gain weight and was losing weight and I was 108 until I started living with my mom I went up to 140. I dropped to 130 after having him. For a few years I stayed between 130-140 at started gaining from stress. We've been together for almost 7 years and I'm weighing 192 I had another child with him in March. We started a diet and I broke! I'm stressed out almost everyday I want this so bad I want to look good I feel unhealthy but Everytime I start something breaks me. Any diets you ladies followed I'm really going to go thru it. I did last year and was 169 but gained it all back.