Hi. I also suffer from diverticulosis and had multiple episodes of diverticulitis, which led to colon resection. I think the problem with strawberries is that the skin has little seeds on them. I have been staying away from them for that reason. Hope this helps...
The problem with corn is that the corn GRAINS may stuck in diverticula and eventually cause infection. So, the problem may be with whole corn on pizza, not with corn bread.
I'm not sure what could be the problem with strawberries.