Your MD is correct regarding the probiotics. The problem is that 93% of the probiotics contained in traditional probiotic supplements will be dead before they ever reach our gut and dead probiotics are completely worthless. Because probiotics are living bacteria, they are also extremely sensitive to even the slightest change in environmental conditions. Due to the extreme acidic environment of the stomach most of the live probiotic cells will be killed off before reaching the intestine. In the end, traditional probiotic supplements, while claiming billions upon billions of active cells per dose, will only wind up delivering a very small percentage of what their label promises alive and well to your gut. You need to eliminate the bad bacteria from your colon , take prebiotics instead.
Unlike probiotics, which attempt to add certain living microbes to the GI tract, prebiotics work primarily by providing the nutrition that these beneficial microbes need to grow and thrive. Since the huge number of microbes in the GI tract can overwhelm the relatively small amounts of bacteria contained in probiotic supplements, prebiotics may have a more significant and lasting impact on health.