Slouchy, one possibility is Lomotil. It’s a prescription medication, so it doesn’t serve your personal liberation goals, but it seems reasonably priced (though it would feel less so at 10 pills per day). I’d suggest at least calling your pharmacy to find out how much it would cost. It’s the closest thing to Imodium that’s available (that isn’t Imodium). In any case, I hope you find a doctor with whom you can have a less adversarial, more constructive partnership.
I’d advise against that much Pepto-Bismol, but you might get good (maybe even better) results from combining reasonable doses of more than one product - some Imodium, some Pepto-Bismol, some psyllium fiber, etc.