Hi babyblue,
Sorry to hear about
your cousin
. My friend gets similar symptoms and she suffers IBS.
With your family history though it wouldn't be out of place to ask the doctor to run tests and keep annual checkups on the colon. It's like any disease that runs in your family you just need to keep a closer eye on yourself.
First up though get an appointment, have some tests done you'll feel better once you have a definite diagnosis.