Severe dysentery

That my wife age 57 years is suffering with many disease such as high blood pressure, migraine Thyroid and diabetes since long is going under treatment at S.G.P.G.I. Lucknow. At present all the ailments are under control but last four month she is suffering from dysentery .That may taken 20 to 22 times daily and passes just like a watery jet. There is no fix time of dysentery sometime it start early in the morning or in the night after taking dinner or in late night. i.e. why she has become too much weak. Dysentery having none bad smell no blood .
I have given him VERATRUM ALB.30 , Podophyllum 30 , Nux Vom 1M but no proper cure has come out . At present she is taking only VERATRUM ALB 30 as B D . Still taking this good medicine last night from 11:30PM the same condition arise and dysentery stopped after complet vacate the stomach. I will be much obliged if you may very kindly suggest a medicine.