I've lost 42 kgs since the beggining of the year. I've been fat most of my life. Got to thin weight three times before, but always bounced back. and for the last 8 years I;ve been unsuccessful in attempts to once again get thin. It finally worked this year and that's for a very simple reason. I finally understood what being obese is. It's not a disease. But a sympton of a disease that's being addicted to junk food. Because unless there's hormonal inbalances involved every obese person is an addict. The simplest test for addiction is if person knows something is bad for them and they still can't stop themselves. So you need to realize that to win and keep it off you will need to treat it as addiction. So you will never be able to go back to eating normally. People delude themselves into thinking they will just control their portions, but sooner or later they fall of the wagon. Trying to get back to normal eating is like if alcoholic would get his one year sober badge and say "Great! I'm cured! Let's celebrate it with a beer". You might do cheat days, be a little less hardcore, but if you want to drop the weight and keep it off you will need to accept those will be exceptions and you will have to eat carefully till the rest of your life.
Now..what works best? Diet, traning, supplementation.
From diet I've found low-carb (especially ketogenic) work the best. I don't fully believe that caveman hype, but cutting carbs just makes sense. You will have to cut calories anyway and cut heavily, The little calories budget you have is much better spent on fat and protein that your body needs than on carbs it does not. Plus low-carb helps to curb apetite a lot,which means you don't have to eat five damn meals a day to not feel hungry and you can introduce 24-36 hours fasts every couple days, which are great or weight loss, since you don't need to be as hardcore in other days. What's more. it makes it easier to control yourself. If you simply won't eat anything sweet, bread, pasta etc..it might sting for a while, but that craving will pass. You will learn to treat it like something that's simply off limits. Just like somebody with peanut alergy won't eat specific products. It's infinitely harder to control yourself if you're still having those products in your diet and just try to not go overboard. So a cheat meal every week or cheat day every two weeks. But aside from those this stuff is off-limits. If you feel craving for sweets kill it by either eating a low carb substitute or by eating something really fat, like fried bacon.
Now training. Since you're heavy a lot of training is out of the question, like running. But since you're heavy as hell walking will work wonderfully. Thin people might think it's silly idea, but they know nothing. Imagine if a thin person would have to walk for an hour a day with a 50-100 kg backback, because that's essentially what you will be doing. I recommend waking up earlier and doing that one hour walk every day in empty stomach. Take a smartphone, load it up with audiobooks and podcasts and that hour will pass like nothing.
Aside from that try weight lifting. Both with actual weights as well as the weight of your body. The second type you won't be able to do a lot at first. That's ok. Just do as much as you can. Start with easier versions and progress to the real deal. For example: can't do a push ups? Do ones standing with hands on the wall. Once you get stronger and lighter, do much ups with knees on the ground and finally a real push ups.
I would also heavily remmend getting a stationary bike. Get a big heavy one. Now, as somebody who's just recently crossed the treshold that makes me only overweight instead of obese I realize a fat man's ass will fall off on stationary bike if he has to ride for a long time. So don't. Instead, take that bike, remove the seat and ride it while sitting on a comfy chair/couch. You don't have to drive fast, but try to use it whenever you're doing passive entertainment, like watching tv, reading books/comics..heck..even playing games.
And supplementation. Here's what works and is safe as long as you follow the dosage: ephedrine stacks, supplemenents with DMAA, yohimbine. None will make you loose weight by itself, they just curb the apetite and make training more effective.
Now, from more hardcore, but slightly dangerous (so don't use them unless you're very desperate) products there are two that work:
gw 50156 also known as carradine. When coupled with training it works like a dream, but some research suggest it might be cancerogenic. So use if only if you're desperate and if you do couple it with tribulus terrestris that will protect you from it's cancer stuff. Plus use it for a month and then do a long break.
Second working, but dangerous supplement is DNP (Dinitrofenol). Now this is very hardcore. It works even when you're not doing anything, so it's great for morbidly obese persons, but for the love of God, if you're going to use it never surpass the recommended dosage, take your temperature twice a day and if it's too high or you have any other heavy side effects stop. When abused this thing can literally boil the person alive from the inside
Just keep at it.