Hi.. Thanks for the query.. Excessive salivation and stomach pain and burping can be due to acid reflux or Gastro-esophageal reflux disease.. Well, all these symptoms are indicative of acid reflux and it leads to regurgitation of acid and food particles from stomach to food pipe and throat.. It leads to excess mucous formation and irritation of salivary glands leading to hypersalivation.. I would suggest you to consult a Gastroenterologist and get evaluated and a thorough clinical evaluation and investigations like upper G.I Endoscopy can help in diagnosis and treatment can be done accordingly.. You can be advised to take Proton Pump Inhibitors like Omeprazole or Pantoprazole.. Take antacids like Milk of magnesia.. Avoid spicy food and drink plenty of water.. Always take walk after meals and take your dinner at least 2 hours before sleep.. You should sleep with head slightly raised as compared to feet.. Hope this helps. Regards.