I did some googling and found this info on pale stools, there is a lot more info when you search in the search engines:
I've had ibs for almost two years now and i go through phases where I have wierd pale stools. I usually describe them as either toothpaste or ribbon like. I was referred to a dietician with my ibs and she said sometimes fibre can irritate the ibs and make it worse. This i found v odd as when you have ibs, all the doctors say is 'eat more fibre'!!! She told me that the stools can become an odd shape because of they type of fibre i had been eating. She suggested i cut down on dietary fibre and use a replacement called pysillium husks which can be bought from a health food shop in either tablet form or in a tub where you mix it with water. This is supposed to be a better kind of fibre. Ive been using it for abt 6 months and have found now I can start introducing the dietary fibre back into my diet and have managed to cut out the psyllium.
I was quite worried when I hadpale stools as I thought all sorts but after a few days they gradually returned to nrmal. I still get this from time to time and it frustrates me!!
Hope you get some good advice from your doc, Tori