Immodium worked very well for me. I also took a couple of glasses a day of psyllium powder (metamucil but I used the Equate brand). It may seem counter intuitive to use a laxative when you are having no such problem. However, the fiber keeps the stool in somewhat solid form and you will not get the rectal burning from the acid in the stool. I have heard from others who did the same with good results. If you do not have the desired result just stop taking the powder.
Good luck with your treatment and hope you have excellent results and few side effects.