I like Benefiber because it dissolves so well in hot liquid as well as cold. but I hear they have changed the formula and I have not tried the new one yet. Acacia lumped in hot liquid when I used it. My GI recommends Citrucel. I am also an A and it can be very frustrating. If I take imodium when having a bad bout of diarrhea, I am stopped up for several days. If D isn't bad, I like pepto bismal. Also great for nausea. Anyway with being A you have to alter the diet somewhat depending upon which phase you're in - less IF during D, more during C. But at least we aren't dull as we are so unpredictable. Heehee.