Do you have experience with Irritable/Inflamed Bowel Syndrome and what relieves your symptoms (diarreah)?

I am not asking this question for myself. My husband has irritable/inflamed bowel syndrome and it has become worse in the last six months. He has modified his diet but is still experiencing abdominal pain and diarrhoea.

If you (or someone you know) suffers from IBS, is there anything you have you done that has significantly reduced your symptoms?

He is going to go back to see his specialist but in the meantime, while waiting for his appointment, if you have any suggestions he can try that have worked for you they would be appreciated.