I'm new to this too (4/9/15 surgery), but I think the V8 with fiber may be your issue. You're dealing with acidity and fiber that your new pouch might not like this early on. I was told to stay away from acidic foods and things like fruit skins (no blueberries...sniff), celery (stringy), etc. I have also heard that dairy can be an issue after surgery, but I'm not sure where I am with that yet. I just keep trying a bit of new stuff when I can, but it's a challenge. I had one really rough night about 2 nights back when I either ate too fast or too much...still not sure. It's a learning experience. Unfortunately, not always an easy one.