Hi OP, I would suggest you contact the GP describing your returned symptoms. As PP have said, if the problem hasn't cleared up you will need investigations (colonoscopy or CT colonography) to see what is going on.
My experience was diverticulosis being seen when I was given a colonoscopy to investigate digestive problems - food moving much too fast through the body, alternating with constipation. The consultant advised me to try the FODMAP diet. That was 10 years ago, and it was transformative. I don't do it as strictly now, but I am still careful to be gluten free and avoid onions, garlic and beans.
During COVID I had my first episode of diverticulitis, with the stomach cramping, high fever and distended stomach. As the GP knew I had diverticulosis confirmed by previous colonoscopy, she diagnosed diverticulitis over the phone and prescribed antibiotics over the phone.
The GP also ordered another colonoscopy a month later to confirm, but this couldn't be completed as the colon was still too inflamed and I had a CT colonography later, where diverticular disease was again confirmed.
That consultant spent some time asking me about my diet and symptoms, and told me that my symptoms when eating porridge and other high fibre foods indicated that I was one of a subset of diverticular patients who did best on a low fibre diet, as the gut was too sensitive to cope otherwise.
I have to be very careful to eat plenty of vegetables, drink water and have more frequent, smaller meals, but I manage to avoid constipation and my only other bout of abdominal pain was likely caused by taking ibuprofen, which I now know is contra-indicated because of my gut issues.
I thought it was worth pointing out that in a small number of cases, the standard approach to fibre for diverticular problems may not apply.
If you do get diagnosed with diverticular disease, though, I definitely recommend trying a FODMAP diet to see whether it eases ongoing symptoms.
Hope you feel better soon.