L.B.
I am sorry to hear you are in pain all the time & now have to deal with the fear of surgery.
Before I had any surgery I would get a second opinion. You may want to look into making an appointment to see a doctor at the Old Irving Park FREE clinic.
Learn what you can about diverticulosis online so you are educated about your condition. I understand it can be treated with medicine. Perhaps you can make some dietary changes and take probiotics (you can buy them online for the best price) daily to restore the natural balance in your tummy.
Wishing you peace & wellness.