However, the majority of us, tend to run things out, before they happen. So along with Stress, there is also a psychological element in our thought patterns that expects us to have difficult IBS days. Running out our worries causes us to have anxiety and added stress, which in turn creates a negative physical response. The annoying thing is, this is part of being human, its a response which we don't have to even try to do, it all happens automatically. What is a stressful event for one, can be invigorating or relaxing event for another.
Every thought has a physical response.
We can prove this by the feelings of love, anger, jealousy, etc. That anger began in the thoughts, was interpreted and an action was carried out, all by the release of chemicals and electrical impulses. Police officers see heightened states every Saturday night when people come out of the pubs, we even have our own language for heightened emotion, count to ten is a good example. In effect changes the chemical releases and electrical impulses - we simmer down. Do the shops have toilets, etc.