Stomach Ache and Gas since last 30 days.

Hi, I was getting gas and stomachache from 04:00 P.M onwards everyday since last 30 days now. The pain was unbearable at night. My doctor administered the following: Week1: Rabiprazole with Domperidone, Magaldrate and Simethicone syrup Week2: Endoscopy: report atached Serum Amylase: 52 U/L (Normal) Ultrasound: report attached Hence, Change of course Omeprazole 20mg, Normaxin, Perinorm Week3: Perinorm, Omeprazole 30mg, Metronidazole(400mg), Amoxicilin(500mg) Sucralfate Suspension Week-4. I was taken-off all medications. New Medication: Neo-peptin syrup after each meal. I was on Fibre diet only for 3 days wherein I was normal. After that I started eating cereals including wheat and rice after which the issue returned though less severe. The pain still returns everyday between 04:00 P.M - 05:00 P.M though the pain is less severe. Please suggest what to do. Current symptoms: 1. Burping 2. Gas in the evening3. Pain in the stomach because of which I'm unable to sleep well.