If its any help, I have just been diagnosed with diverticulitis about two days ago. Went to the ER with severe abdominal pains and was given an emergency scan of my abdomen, followed by a colonoscopy. This showed inflammation of my large intestine generally and inflammed diverticula pockets. My bloods showed a raised white cell count and sed rate, so I was sent home with antibiotics and was also given an anti-inflammatory pain shot.
Although the pain I had was at the lower left of my stomach (Left Iliac Fossa), it is not uncommon to have pain all across your lower stomach either. Pain can be referred. You could also have back pain and stomach pain together because of the nerves. The nerves travel from your spine and go around your stomach too. It is more common to have lower left stomach pain, as this is where your descending colon runs and where your sigmoid colon, rectum and anus are. This is the most common place to find diverticula pockets.
Basically, you can have inflammation without infection, so you may not have needed antibiotics. If however, you have stomach pains, possibly some diarrhea and a fever, then this probably means that you have infection with the inflammation as I did and will need antibiotics to clear it.
Try not to worry too much. The colonoscopy did show inflammation and diverticula in your bowel, so it is highly likely that this is the cause of your stomach pains rather than anything more sinister.
If you have a lot of gas, I would suggest that you start a Probiotic supplement. You can eat live yogurt , as this contains Lactobacillis, the good bacteria that lives in your gut. Also, you need to avoid constipation, so you should consider starting Metamucil twice daily or Citrocil wafters. Try also to eat a good diet and avoid nuts or things that could get stuck in the pouches and cause you stomach pains and infection again.
Hope this helps?