I absolutely agree that smaller more frequent meals may help your digestion.
My fiancé had digestion issues and migraines caused by foods, and I will suggest the same thing to you as I did to her - A food log.
Try and write down and track all foods, and write down WHEN you get discomfort, and look for the patterns after a couple of weeks! You may find it is from certain food groups, or a combination of foods, or just from volume, you never know until you really break it down!
She was able to pinpoint that dairy and some vegetables caused her stomach pain, and that coffee and some fruits gave her migraines, never would have guessed all of that without a food log!