I can tell you that for me, there is a big difference between no carbs and even 30, 40, or 50g of carbs in terms of my heart rate, adrenaline, etc. I would experiment with different amounts and see what kind of relief you can get from the stress state without triggering GERD. There will be some idiosyncracies around which carbs are best for you, but on paper, your best bets are low fodmap, low acid, and high glycemic index. I do well with jasmine rice, sticky rice, and even small amounts of white bread or crackers. Potatoes can be OK but there is a lot of variability among the different types as far as resistant starch content, amylose vs amylopectin content, etc so you have to be careful there. With fruit, the options that fit those criteria are very limited, but I do alright with moderate amounts of cantaloupe and oranges (least acidic varieties available).
Also very important, never eat refrigerated starches if you are trying to increase digestibility of carbs. They form resistant starch at cold temperatures. That means you need them freshly cooked, or if it is bread, it needs to be stored at room temp after baking. Key detail here that makes a huge difference.