HI. It is good that your endoscopy, liver function tests and ultrasonography are normal. It looks to me that you lower esophageal sphincter is lax and so allows the stomach contents to come-up. Please try Dompridone in a dose as advised by your Doctor along with Ranitidine so get a good relief. Stop fried and spicy food, Go fro small frequent meals. Stop tobacco / alcohol in any form ( if you are taking ). Do not lye immediately after food. Have a stress-free life.. All this adds to a better treatment. If there is no result with these measures , You may have to undergo tests of barium studies to see there is no obstruction in the upper small intestine which indirectly cause the problems as you are getting.