Irritable bowel syndrome. No issues.

Hello doctor My mother has been havin loose motion for the past 3weeks.whatever she eats or even drinks like water is all passed out as motion like 7 to 8 times. shes having Loss of appetite,nausea weakness,abdominal pain and loose motion. 2yrs back she had the same condition and we got colonoscopy done and.doctors.told no issues.it myt be IBS(Irritable Bowel Syndrome) Guessing its the same condition. Shes getting weaker and just got saline drips 4days back and again she had to put drips due to excessive weakness She is diabetic and doctor suggesting it myt be due to the tablet she is taking for diabetes that is giving her this difficulty and triggerin this condition. Kindly help and advice us what to do to relieve her from this condition