Statement number 1:
I have absolutely no expertise whatsoever in such matters.
Statement number 2:
It is not my intent to worry you.
However, here's the 'Treatment' page from the NHS website, dealing with diverticulitis:
http://www.nhs.uk/Con.../Pages/Treatment.aspx
You'll see that it makes no reference to radiotherapy and, with my very limited knowledge of such things, I can't think of any way that radiotherapy could be of any use in treating diverticulitis. That view seems to be backed up by the NHS pages dealing with radiotherapy:
http://www.nhs.uk/con...ges/introduction.aspx
Regrettably, I fear that your worries may not be unfounded.
Chris
PS: If 'Sqad' posts on this thread, his views should be taken as about a zillion times more important than mine, because he's a doctor.