Everyone is different. When I had my takedown, no one (not surgerons nor GI docs) instructed me to take fiber (Citrucel, Metamucil) etc. I took Immodium (still do). I also control the fluid intake- avoid adding sugar/sweet/salts to your fluids as this will only make you go more. Just my experience, but I would cut out the fiber for several days, and use only pure water- no sodas, Gatorade, coffee, etc and see how you do. Patience is the virtue- its takes a lONG time for things to settle down. For me, it's been years (takedown in 2007), so its a journey; no quick fixes.
Hang in there and good luck,