Constant fluid coming back into throat - help!

My GP initially thought I had gall bladder symptoms but now thinks its something else.  Hes put me on 40 mgs omeprazole daily (losec) but every time i eat I get regurg coming back into my throat instead of a burp!  Gross I know.  Its stained with brownish streaks. Im a coffee drinker so it could be that but still its worrying!  Its caused me chest pain central high and going directly through to my back between my shoulder blades.  Does this sound like GERD?  Im very confused.  Hes scheduled an endoscopy for me which will take about 4 weeks, but i would like to hear if any others have acid/fluid coming back into the throat, and more importantly if its stained! Thanks in advance

food or liquid coming back into throat can be reflux and it will be whatever color food you just ate or can be dark because what little acid in the stomach after taking a ppi breaks down the food...

if you have gerd stop drinking coffee... coffee relaxes smooth muscle which is the lower 1/3 of your esophagus... when you relax the muscle you allow reflux to get worse...

pain from swallowing can be achalasia spasm in esophagus which runs right down through your chest into your stomach...

do you get full quickly? bloated? those symptoms along with pain and reflux can be slow motility or delayed emptying known as gastroparesis... can happen from a virus, from anything really...