I am experiencing stomach upset and stomach problems.

See a doctor: You have not told us nearly enough about your symptoms. There are many types and causes of stomach upset/problems such as infections (H. Pylori, parasites, yeast overgrowth, viruses etc.), food allergies/sensitivities, toxins, lack of hydrochloric acid, stress etc. You need to see a good doctor (ideally an integrative Dr.) who can further evaluate you to determine the cause and best treatment.