Chronic symptoms since 2015 suggest an underlying issue like Irritable Bowel Syndrome (IBS) or food sensitivities, which a high-fiber vegetarian diet can sometimes worsen. For symptom relief, you can try: 1. Simethicone to help break down trapped gas bubbles. 2. Psyllium husk (soluble fiber) to improve stool consistency, whether loose or hard. 3. Probiotics to support a healthy gut microbiome. 4. Alpha-galactosidase enzymes taken before high-fiber vegetarian meals to reduce gas production. Since these symptoms are long-standing, please consult a gastroenterologist to identify the root cause. These issues are very common and highly manageable, so there is no need to panic.