60lb to lose

Hi all. I've put on 60lb over the past two years. Had always been fit and slim then ended up in a coma, critically ill in intensive care for a month. Was left seriously underweight and had to build myself up again. When I got back to my normal weight I didn't get back to my normal diet and eating habits so now here I am really fed up and ready to do something about. Just joined a gym. Any support greatly appreciated.☺