6 weeks in but have stomach issues

So I held off asking this question to see if I have a bug or something, but it's been almost 2 weeks now and my issue persists so I feel like it's not a bug. I'm doing 16/8 and eating normal (not Keto). The fasting part is easy for the most part, I don't feel super hungry and my stomach isn't groaning or anything. Then I eat my first meal, it's usually a sandwich or maybe eggs, or a burrito. I feel great but a half hour later, my stomach starts to ache and it lasts for a couple hours. THis happens after dinner too. I have diarrhea at least once a day. It doesn't matter if I eat something crazy or something bland. I feel like crap all the way up until I go to bed. I've given up drinking coffee on an empty stomach, high acid foods, etc.Anyone else experience this? via /r/intermittentfasting https://ift.tt/2C1BN8G https://ift.tt/eA8V8J