What Causes Hardness In Stomach When Diagnosed With IBS?

I am a 44 yr old female. I have a general ibs diagnosis, but have never been prescribed medication nor placed on a specific diet to try and avoid the symptoms. I had my first colonoscopy Aril 2010 and was due for another in April 2015 because they found a polyp in 2010. I finally got around to making an appointment yesterday, but will not be seen for a consult until the end of July and likely will not have the procedure until October due to my busy work schedule. For a while now, at least a month...maybe longer, after most every meal I feel like I have pop rocks in my stomach. It s uncomfortable and embarrassing to have to continuously run to the bathroom while at work. I don t really know what to do.