Taking stock of yourself is going to be most important. Eliminating stress
and inflamatories (i.e.
caffeine, alcohol, smoking, spicy foods, raw vegetables that promote gas, anti-inflamatories like aspirin, ibuprofen on an empty stomach, etc...) is very, very important while you are having episodes of IBS.
In your case? Because I believe your doctors scared you to death at the mention of cancer? Do something to change your way of thinking. Yoga, exercise, enjoying good books in the park.