Have you been scoped yet? Usually nighttime bathroom trips are a "red flag" symptom - IBS doesn't usually wake you up at night to use the bathroom - so I would mention this to your doctor. It is not uncommon for people with IBS to have symptoms at seemingly random times, though, in addition to the typical bouts that occur during periods of high stress or anxiety.
Co-moderator - IBS Forum
Please always remember to consult your medical professional regarding your medical questions; this forum is intended to provide patient-to-patient support. Although some of us have healthcare backgrounds, we cannot diagnose or treat patients on the board.