Hello~Most of your symptoms point to a hiatal hernia which is causing GERD. Have you been checked for this? As to the pins and needles sensation, that would appear to be due to pinched nerves. I would suggest seeing a chiropractor for the pins and needles, and possibly even mention the gastric issues, I have the burning in my throat from acid reflux, he fixes mine by a simple adjustment, he also helps with my other issues related to nerve impingement.
Sorry forgot to mention these symptoms
-previously felt very nauseous but the nausea felt like it was coming from the throat area rather than the stomach. This has mostly subsided now also.
-When all of these symptoms first started, I felt fatigued and my back muscles felt particularly tired and it was extremely uncomfortable to even sit down. This has also subsided.