Disclaimer - I hold a diagnosis and not a medical degree.
Depending on other conditions you may have ie. chronic, gluten allergy, etc, in my experience, I try to keep as close to natural as possible and to keep to a schedule. I realized that I was skipping meals when I was in more pain, which can lead to other issues from dehydration to others.
Try to keep a log of what it is and when you have it - cross-reference this log to how you are feeling. Ate something that makes things worse? take out that item or ingredient for 2 weeks, and then if you are slowly feeling better add that to the don't touch list.