Since your symptoms have lasted for three months without relief, it is highly recommended to seek a professional diagnosis rather than self-medicating. 'Gastric problems' can stem from acid reflux, gastritis, or food intolerances. For temporary relief, over-the-counter generic options like omeprazole (to reduce acid) or famotidine can help. However, you should consult a gastroenterologist. They can perform simple evaluations, like an H. pylori test, to pinpoint the exact cause and tailor a safe, effective treatment plan. Please don't worry, as these chronic symptoms are very common and highly treatable once properly diagnosed.