Infections or certain medical conditions are the possible causes of diarrhea. When you are already taking rifaximin and still not feeling better, it is crucial to communicate again with your doctor. They can go for more examinations or try other methods to cope with your situation.

You might have a condition called indigestion. Symptoms include weakness, a bitter taste in your mouth, and lack of energy even after eating a meal. Overeating is another factor that can make it worse. To get better, you should eat smaller meals, and non-spicy food, and not lie down right after eating. Avoiding late-night snacks can also be a nice decision since it will help you relieve symptoms.

Combinational drug diclofenac-misoprostol is widely used to alleviate pain symptoms. But it may cause some severe side effects including abdominal pain and bleeding, especially in patients with ulcer history. If any of these symptoms occur, you should visit a gastroenterologist immediately. It is highly advised that you do not take any medications unless a doctor has prescribed such.

Judging from the information you have shared, there are chances of you having lower abdomen pain caused by diaphragmatic strain or inflammation. It is necessary to seek medical assistance, such as a gastroenterologist or a GP doctor.