So I'm going to stray away from the 5 meals a day topic for a moment... Momto3 mentioned domperidone. There are actually a few medication's available for GP symptoms. Even if you require meds it's normal that you need to learn what food works and what doesn't, so, it's good to get nutrition figured out first. Same thing with the gallbladder, even if it's going bad, you'll likely have to adjust your diet whether you keep it or not--so may as well learn now how to eat healthy.
Of the motility medications, Reglan is one that is available but has been associated with permanent Tardive dyskinesia. The FDA has recently published an updated warning about it (but the TD association has been discussed for some time). The other, Domperidone, has been used in other countries for a long time and in the past in the USA. From what I've read, it was supposedly dropped in the USA because it was being (ab)used or wrongly prescribed for it's side effect of lactation. I've also read about the reports of cardiac arrhythmia and sudden death in patients with malignant disease who received relatively high intravenous doses. Those concerns are not generally associated for those taking it for GI issues, but I really don't know. There's also a few antibiotics that are sometimes prescribed because of their association with increased motility, but those are shorter term options. I've also read of some other medications for depression and other neurological symptoms that may be suggested. Thus, if diet isn't working there are other options.
Given all the controversy, I looked into natural options. There are also some alternative treatments (like Acupuncture, but I can't provide feedback on that). As for herbs, If you are near a decent health food store, you may want to check out what they have and/or suggest. I've already mentioned DGL Licorice, it works for me to reduce nausea. I haven't tried, but I've heard that digestive enzymes can be helpful. I've also heard some mixed reports from folks using an herb derived from the Strychnine tree, "nux vomica" to aid in digestion--that's probably the most controversial herbal option I've heard of. There are quite a few .gov / .edu sites out there with medical/scientific research to aid in your journey, so you don't have to make decisions based simply on the hype. Tip: Add "In Vitro" or "In Vivo" to your searches to help pull up medical research documents.
To get back to diet, I'll go back to my experience down this path and say that I did well following the recommendations for the gallbladder diet... but... don't get stressed out on exactly what to eat. Perhaps you'd do better following a gluten-free diet, or a specific carbohydrate diet, etc. Just keep track and be methodical, start out with a real simple diet for at least a few days (whatever diet you choose to follow, minimize the # of items) and slowly introduce new items into it. I found for me it can take 2-3days for some symptoms to appear. So, every 3days or so I would try something new and wait. [The Gluten allergy symptoms can take weeks to clear up, so you may want to go even longer before introducing some foods, but I wouldn't go any less than a few days.]