The medical community at first refused to believe him. He had to intentionally infect himself with the bacteria to prove this. For more information check Dr. Marshall's web-site . Any gastroenterologist can test you for it. The least expensive and most accurate test is the breath test.
Stomach biopsy is a bit less accurate and much more expensive.
Other bacterial infections can cause both stomach discomfort and fatigue. There are no tests for most of these. If doctors suspect them, they will usually treat them without any tests by simply prescribing antibiotics. Antibiotics may cure certain GI problems, but can make others much worse . See the Candida Albicans section below and the Safer Antibiotics page for more information.