Dear. It sounds to me like typical stomach disorders such as gastritis
, GERD or hiatal hernia. It causes abdominal bloating
and distension,especially after meal. So if you want to find it out then do gastroscopy and stomach biopsy. Till that you need to change your dietary, eat more fruit and green, less alcohol smoking
and fast food. Also after meal dont lay or sit. Just walk or stand for a while, until food pass through the stomach and duodenum
. When you lay try to be on your right side.
Wish you good health.