Chronic gas, bloating & flatulence is a common IBS symptom. Those with IBS often find that they have more flatulence than they did before they got IBS. They may also experience bloating to the extent that their gut protrudes outwards. Wearing tight clothing or a belt can become uncomfortable & you may feel more fatigued as well. Gas & bloating may also result in the feeling of urgency, where one feels the need to rush to a restroom only to find that they need to pass a lot of gas.
Disclaimer: I am not a medical professional. Using this information is at your own risk.