Ache discomfort left groin, hip sometimes around belly button. Doc says not hernia. Could be IBS? Stomach popping time to time. Easy test to find out?

Groin pain. The features of IBS are stool irregularities such as diarrhea or constipation, abdominal pain, more so cramping in nature, bloating, gas issues, etc. your history is not very suggestive of IBS but perhaps more history and exam is needed to further clarify your symptoms.