I eat little but im still overweight?

Patient: How can I lose weight? I’m 16-17 stones!

Symptoms: Well, first of all I’m never hungry anymore. I used to have severe asthma attacks when I was little and doctors put me on steroids or something could this be the cause? I used to eat loads when I was younger but ever since puberty I’ve began to eat ordinarily if not less. I get stressed easily too ever since we moved I dunno if that could be it because I put on weight before that. I eat very little as one time I went two days without eating and the other day I only ate a sandwich but I drink loads and I’m not hungry.