Sounds kind of like my mother. No gallbladder, IBS, diahreah one day constipation the next 2. Migraines, Needs Lorazapam just to sleep at night.
Her diet is crap and she doesn't even try changing it.
I've been trying to get her to do Colonix..so I'd recommend that. Or at least something similar.
I know there are many people who do The Master Cleanse
without a gallbladder and have no issues.