Boliver, it is 19 days post surgery for you. Are you eating any solid foods? As I recall I didn't any until three weeks post op. 5 day pouch test is great but honestly it shouldn't even be on your plan at this stage.
What type of food are you eating right now? Suture lines need time to heal, it isn't about stretching at this point (it WILL cause stretching issue if you over eat early on) it is about ripping open which is infinitely worse than stretching as it can be life threatening. Docs give instruction during the post op period NOT about losing weight but about healing in the healthiest fashion possible.
If you are off plan, I would schedule an appointment ASAP and see doc and or counselor/nutritionist. We all have issues, it is what brought us to where we are. Now is the time to do what you need to do to heal. Please seek out help to make choices for your health. ((hugs))