This is never an easy decision. Results are usually better when you are fit and well; that is, elective surgery. Emergency surgery after a rupture will often lead to an ostomy. I would suggest getting an MRI to determine whether you are in danger of a rupture. Abdominal surgeries are never easy on you. These surgeries leave adhesions which can lead to later blockages. If the MRI reveals you are close to a rupture then definitely have the surgery. If not, delay the surgery as long as you can with the understanding that your situation will never get better.