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The diverticula seen on CT scan
may just be incidental finding and your symptoms are not completely due to it.
I would like to know are you constipated? If you are, it requires evaluation for the same. Presumptive treatment with amoxicillin
is not advisable when clinically you have no features suggestive of active inflammation, to the contrary you may get cramps and diarrhoea
due to injudicious use of antibiotics.
I would suggest you to discuss your diet and bowel history in detail with your consultant who will be able to guide you.
Do get back to me with your diet details and any other significant medical history.