How can I get control of my weight?

is there anyone that can relate? I used to be overweight, but then lost about 35 pounds just eating healthier and excercising. My family started putting pressure on me to gain pounds because they were afraid I was becoming anorexic and were not used to eating healthy or seeing me be that healthy. I felt so pressured that I finally listend to them I started to gain weight, and now my worst nightmare has come to life…I cannot stop gaining weight. I know what I need to do to loose the weight, but every time I try I end up loosing control. I am so tired of this and am depressed and not myself. I am so uncomfortable in my body that all I wear are sweats and I never like to go out anymore. I have even reverted to bulimia in attempts to loose the weight, but it has only made me gain more because I binge. this is not who I am and I just want to go back to the happy, fun-loving, energetic, in-control, thin person I used to be. Can anyone relate, and if so how can I loose the weight and regain enough control to keep it off?