Hi welcome to Health care magic forum.
Thanks for calling H.C.M.
All the symptoms of gastro intestinal irritation must be due to prolonged usage of the bisacodyl
. With the doctors advise you can switch to some other drugs for purgative purpose.
I advise you to follow some diet recommendations as take more of green leafy vegetables, pulses, sprouts, and take plenty of water to promote smooth evacuation and repair of the gastro intestinal mucosa, and to provide enough of blood.
Wishing for a quick and complete recovery.