So I have dealt with this but I found the trigger. I have celiac disease plus I am lactose intolerant. So no wheat no dairy I am good to go. Food logs are helpful for some. What you eat when you eat. IBS is a phrase that has many meanings but little insight to why. From caffeine to stress. I have always looked at diarrhea as a way your body is projecting something out ASAP. You don’t describe cramps or stomach aches. Nausea is another biggie. I used to schedule all my appointments in the morning. Did not eat or drink till I got home. Then eat. Sorry your going thru this.