Two things.

Food addiction is real, it should be treated like an addiction. The last thing anyone who's had an unhealthy relationship with food is taking on other extreme approaches like fasting/keto etc. Go see health promotion, learn the basics about food and once you have momentum and more importantly a healthy relationship with food, you can hold yourself to a higher standard. For now just eat in moderation and don't crucify yourself for slipping up occasionally, we're human.

Second, seek out the help of PSP and request your CoC support because you want to be healthier. Be transparent, they'll be happy to see you taking care of yourself.

You got this.