Hi there,
I hope you are feeling better since the last time you posted?
The PPI's takes a while to come into full effect, but at your young age I would definetely go to a Gastro Enterologist and have an Endoscopy done to see why you have the reflux. Hiatal hernia? I would think that a hypotensive LES at your age could be unlikely, but you need a few tests to get to the bottom of this.
The burping after every meal sounds like acid reflux and you are already on PPI's. That's why I would get it checked out.
Get yourself on a heart-healthy diet and an excercise program to. Avoid the acid-triggers, don't smoke and elevate the head of your bed.
Please let me know you are doing. All the best,
Could be GERD or a gallbladder issue.
Could also be anxiety related...and anxiety and GERD do go hand in hand.