My doctor diagnosed me with IBS a few years back. It is a diagnosis given when they have discounted all other possible causes of the symptoms that a person is having.
I find that taking loperamide tablets to prevent diarrhoea at inappropriate times takes helps - I no longer have to worry about having to rush off to find a toilet.
Getting down or stressed about it will actually make it worse. I think that you would be surprised at the amount of people who suffer from IBS to varying degrees. Some times talking about things with others actually helps.
Best of luck.