I understand your concern
Diverticultis cause is inflammation or infection of the diverticula in the colon.
Treatment would depend on whether the flare up/inflammation is mild or severe.
You can take following advises:
For mild type
Continue clear liquid diet
for at least a few days
Course of antibiotics, 2 antibiotics may be needed Soft diet
can be taken
I would suggest to consult gastroentrologist and undergone CT Scan to know repose of treatment and to find other cause.
Ask for take some broad spectrum antibiotic like levofloxacin
For pain tablet acetaminophen
, tablet dicyclomine
gradually switch over to normal diet with fibers as relief gained.
Hope this may help you
Contact further if follow up needed