The symptoms also came on for me pretty quickly, one week I was eating a cheeseburger and ice cream and the next week it made me sick. I found it helpful to keep a food diary because everyone is different. For me, I am now lactose intolerant. My doctor also had no explanation for why EPI happened, his guess was old age, I was 65(is that old?) when diagnosed. Try switching to some plant based diet options, think fruit smoothie with a scoop of protein powder and oat milk and you only need 1 Creon or ZenPep. I live in Florida so I use frozen fruit and chocolate protein powder and pretend it’s a milkshake.