Trust me, do it healthily with exercise and the like if you are able to. Suddenly restricting can actually make you gain more since the body goes into starvation mode.
I empathize with your predicament OP, but ophelia is right; it will do far more harm than good.
I used to be able to naturally maintain a normal weight without even thinking about what I ate, then I got an eating disorder, which in turn caused post-starvation hyperphagia (ie. extreme hunger -- and we're talking
extreme, like 10k cal a day). This was my body's way of building up protective "collateral" fat so that the next time I starved, it would have more energy stores. Something similar happens to most people with EDs, so they end up even larger than they were to begin with.
But that's not the worst part tbh. The worst part is the fact that it takes
everything from you: your physical health (I now have nerve damage and GERD), your mental health, your friends, your family, your partner, your finances, your hobbies, your sports, your soul. I would not wish it on anyone.