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Irritable Bowel Syndrome
may present itself as diarrhea
or both alternating to each other. As the Gastroenterologist has ruled out any problem then most likely its IBS. For symptomatic relief you have to take diet rich in fiber and low in fat. Newer medicines like Linaclotide are very useful in IBS with constipation. Antidepressant drugs are also useful in IBS. I will advise you to please visit a Psychiatrist
for proper evaluation of problem.
Dr. Seikhoo Bishnoi, MD