Are you currently taking any digestive enzymes? One thing that you may want to consider before the stool sample test is going off of those for 5 or so days. I had all of the symptoms of EPI when I took my first EPI test but results came back fine. After doing more research on my own, I found recommendations regarding temporarily stopping the use of digestive supplements. I asked my GI doc to reorder fecal elastase test and this time it came back indicating EPI.
Also, I did test positive for SIBO which was ordered by a dietitian. The antibiotic prescribed for that helped a lot but it did take a couple rounds of using it. Best of luck to you.