Did the doctor say anything about your digestive flora? The problem probably manifests after eating. Have you tried probiotics? There are some good ones on the market. If it's in the digestive flora you may want to either eat raw veggies and juice them with fruits, or start a good regime with some good probiotics, depending on the problem. Now days docs are prescribing either probiotics or yougert for intestinal balance. Be careful to take the charcaoal 2-3 hours after the other meds, otherwise it will absorb everything in your system. The Mebeverine is for the IBS symptoms. If you are taking Charcoal you should definitely be regular by now. Also did you try colon cleansing before starting your regime? I know that Charcoal works but if you are only taking one trying increasing it to two at a time instead of just one 2-3 hours before or after your other meds. I used to get mine from Walgreens when I was taking it was 18.00. If you get the charcoal from a health store or online it's cheaper and you may can get one with more miligrams. That's what I had to do when I was taking AC. And don't forget the doc may have mentioned a changing in your diet.