Thank you for the query.
It is possible that you have pathologic intestine bacterial flora growth. It might be caused by your hospital stay for nose surgery
where bacterial flora is completely different than anywhere. Such bacteria growth impedes proper intestine work. It is quite common factor which causes IBS
It is advisable for you to try Rifaximine treatment prescribed by your doctor. Before that you should have abdominal ultrasound
and foll blood work and urine analysis.
Hope this will help.