Have GERD. Gastric sleeve 2013. Are at red lobster, 20 min after got trapped gas pain in chest, back and throat. Is it GERD? Not had that food longtime

Careful chewing. After having esophageal or gastric surgery it is always important to fully chew your food. Gas from seafood sounds rare. You would not expect GERD from air being trapped. However if you ate quickly and swallowed a lot of air you might feel the pain as you noted. .