You dont need a support group, just google Diverticulitis. Sensible eating will help. No curries, spicy foods, nothing white - bread, flour, rice etc. Plenty of fruit and roughage. Common sense really. This should settle it, as well as antibiotics. If the worst happens they will have to operate and remove part of the gut but as you have about 20 feet of it, it doesn't matter. Your friend will have a colostomy bag until the inflammation and operation heals, this could take six months but worth it in the long run. Good luck x