Hello, I have gone through your query and understand your concern. I suspect you are suffering from Peptic ulcer. The stomach pain after eating is due to the peptic ulcer. The bloating and flatus as well as burping all are due to your smoke. While smoking, you tend to inhale more air and smoke than non smokers. This inhaled air enter into oesophagus, stomach and then to colon. This cause the burping and excess flatus than usual. In turn smoke is a main risk factor for Peptic ulcer and it may prolong the healing of peptic ulcer and also increase risk of h.Pylori infection. As you have the stomach pain immediately after taking food, you have to go further evaluation like upper GI endoscopy after consulting a gastroenterologist. He may advice to quit smoking and Proton Pump inhibitors like omeprazole for peptic ulcer. Better to quit smoking Hope this helps. Please write back for further queries. Wishing you good health.