Thank you for your queston. It is difficult to give you an answer without any photographs. However, Coolsculpting is not good for tightening the skin. It sounds like you might benefit better from a tummy tuck and/or liposuction. I recommend having a consultation with a board certified plastic surgeon to determine the best treatment plan for you. Best of Luck!
Although CoolSculpting is effective on the abdomen, the primary concern after a significant weight loss is usually excess skin, not fat. Without the fat to fill it out, skin becomes loose and saggy. CoolSculpting is not a skin tightening procedure and therefore wouldn't be a good match for you if that is what’s needed. I recommend seeing a qualified plastic surgeon or dermatologist near you who can help determine the cause of your hanging belly. Once you know what's causing it, you can move forward with an effective treatment.