Your digestive symptoms suggest Irritable Bowel Syndrome (IBS) and acid reflux. However, the combination of fatigue, shortness of breath on exertion, and sudden weight gain requires a professional medical evaluation to rule out conditions like thyroid dysfunction (hypothyroidism) or fluid retention. For acid reflux, an over-the-counter proton pump inhibitor like omeprazole may help. IBS symptoms can often be managed with dietary adjustments or antispasmodics like dicyclomine. Because your systemic symptoms could indicate an underlying issue needing specific treatment (such as levothyroxine for thyroid issues), please consult a doctor promptly for blood tests and a personalized care plan.