To answer your question; yes you can lose weight but at your current weight it must be done under medical supervision. You need to check into a hospital and have a medically supervised weight reduction program and possibly, if your body can stand the surgery, gastric bypass surgery.
It will take several years to get down to a proper weight. Once you reach that weight you will want plastic surgery to remove the excess skin left over from the weight loss which in your case will probably weigh 50 to 100 kilos on its own.
Most important and I mean this; if you want to live you need to check into a hospital today. Your heart cannot support such a weight and the sooner you get treatment and start a supervised weight loss program the better your chances of surviving are.
I'm not a doctor, only a doctor can tell you how much harm you have done to yourself and whether that harm is reversible. Whether you live or die is in your hands. Do noting and you will die. Check in to a hospital today and your chances of survival increase each day. The choice is totally yours. [ adviceman49's advice column | Ask adviceman49 A Question ]
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