Hi, Welcome to health care magic, Dizziness or light-headiness in any position is concerning. It could be due to variety of causes or it could be transient. Perhaps if the dizziness is not troubling your day to day work, then you may wait for few days. Until then you may take proper hydration and electrolyte balance with some symptomatic antihistamines treatment like betahistidine. Do not panic. However if the problem is persistent, you should see a doctor at the earliest and get evaluated further. I will suggest you undergo routine blood count, ESR, blood electrolytes, tests for vestibular (balance) system like electronystagmography or rotation tests to diagnose the cause for dizziness. Burping or belching is way of body to expel out air from stomach whether it is due to excess swallowed air or produced because of food digestion or acid reflux or gastritis etc. It has nothing to do your ortho-tricylen pill or your past pancreatitis or gall bladder surgery. you should take medicines like proton pump inhibitors (pantoprazole or rabeprazole) with prokinetic drugs(levosulphride,cisapride or mosapride) During deep breathing some amount of air get swallowed in stomach through esophagus. Deep breathing exercises is good for your lung but whenever you take a deep breath, it must be taken with your nose only because even slight open mouth will allow the air to get swallowed and lead to belching. In addition,you take out breath through nose very slowly while keeping lips pursed. Eat high protein and easily digestive food rather than carbohydrates or fatty foods. Drink much of water will reduce belching. Consult gastroenterologist if there is any underlying stomach problems like hiatus hernia,reflux esophagitis, gastritis, gastric ulcer. Thanks and Regards,