Gas pain lower abdominal area for 2-3 days. not common for me. no dietary changes, no other symptoms (normal otherwise). could this be from ibs?

Of course-yetCareful: IBS, like most diagnoses, is only a label for a pattern of behaviors with various associated symptoms, possible anatomic variations &/or biomarkers (commonly by blood tests). The label, while at times useful/convenient in various ways does not necessarily reflect great understanding, one reason many medical treatments do not work well; http://goo.gl/Blh6rW. If symptoms only short-term, unlikely.

Too : Short a duration of symptoms to establish a diagnosis of IBS. Constipation or eating of certain diet could cause such symptoms