Have you heard of the HCG diet?
It's a (doctor prescribed) hormone, most people take it under the tongue, that allows you to eat only 500 calories a day, and causes your body to use the fat as energy instead of food. The cycle is like 30 days, first two days you eat whatever you want, then by day three your hunger is gone.
I've actually seen a few people have success with this. I've not tried it myself, and can't recommend it confidently, but...maybe worth looking into?
It's mostly clinics with a doctor on staff, they write the prescription and it runs like 30 days at a time. Seems like sketchy too me, but, maybe its not - I've seen a few people drop weight on it.
Maybe worth researching.