When i had my gallbladder removed i felt the same way with the bloating when i ate. My husband soon found out if he gave me a sprite and I drank a good drink of it that i would belch and the air bubble would pass, eliminating the shortness of breath. i too have GERD. The sore throat comes from the acid coming back up into your throat at night, to alleviate this take and raise the head of your bed or get more pillows to sleep on. Are you taking Nexium, protonix, prilosec or Prevacid, they knock down the acid?
You are right as, these medicines surely helps in coming over this acidic problem but, I think it will be better if you avoid intake of cold drinks that have effervescence as, due to this you will surely feel all such things that you have told me and therefore, it leads to a problem.