I can relate. My mother had many psychological issues...and she was anorexic. But she took a lot of it out on me. I wasn't heavy yet, but she'd portion my meals and all that. If I wanted seconds she'd say to me, "If you eat that boys will never like you". Or "You really don't need seconds". She'd constantly pick at me for my weight in reflection to her own image issues.
I too would hide treats in my room. I'd get candy while over my grandparent's and keep it in one of those square makeup boxes with the lock. When she wasn't home, I'd eat anything I could. I'd just act like my stepdad ate it.
I think things like this really contribute to our unhealthy relationship with food. I got out of my mom's house when I was 14. I gained a lot of weight and I developed the habit of emotional/binge eating. Endless nights of indulging and guilt. But now I am doing it the healthy way. It takes a lot of time. There's still days I want to go back to where I was.
But we're strong. We can do this!