DB,
Hello and welcome to HealingWell. You posted " the heartburn came back with a vengeance!" - then you posted "But since my GERD is silent and there is no heartburn....."
I and a bit confused by this as I suspect you are having heartburn and looking at your diet is a wise decision. You GI sounds like he knows what he is doing IMHO.
I wish you the best and hope a diet change increases your quality of lie.
Kindly,
Kitt