I am 40 years female. I am suffering from IBS. Taking medicine like zolpidem and mirtazipine since 5 years. I suffer from hyperacidity during menstrual. Is this the problem due to above medicine. I even suffer from insomnia during menstrual even on taking above medicine. Is there any other medicine for sleeping as I think the above medicine is causing stomach problem. I always feel my stomach is empty even after eating. So not able to sleep properly. I am taking pan 40 almost regularly. During menstrual my stomach problem starts mainly nausea and burning sensation. I even follow strict diet. Still there is problem. Please help me to come out of this.