Hi. Thanks for your query. Noted the history and understood the concerns. Problems like acidity, gas, dizziness, nausea, increased heartbeat, bitter taste, and so on are usually interlinked and may be related to the acidity in particular. Stress and anxiety looks to be the basic cause hence control of it is very necessary. In addition I would advise you the following: Consult a Gastroenterologist. Upper GI Endoscopy. Ultrasonography of abdomen. Get started with a symptomatic treatment with a PPI like Omeprazole, antacid and Domperidone as motility regulator. Other symptoms may improve then or add on anxiety medicines and others like multivitamins and so on.