Generally if you take antibiotics you want to take the full course, not just a day or two here. Taking them for too little time can increase drug resistance and make it harder to treat either in you or when someone else gets bacteria from you.There can be some achiness from abdominal surgery so every pain may not be another infected diverticuli.I'm not sure it treating the pain with the meds or heat will prevent the infection or make it go away once it starts. However the diet and aloe are usually things that help the infection from starting.