Have you ever had an EGD and colonoscopy done? That is the best way to know if you do have any digestive issues. I don't think chrohns or colitis just randomly start with a force either.
You can also have a stomach bug. Many stomach bugs last several days. I had one recently, and it last about a week. I've heard they can last two weeks. You may still want the doctor to check for an infection, especially if it's been that long. Stay hydrated too.