Have you been tested for things that could have been present since childhood - coeliac disease, lactose intolerance, food allergy? I don't think you were necessarily always on track for GERD but it's worth ruling out things that could have been missed in childhood.
Try to look at your GERD in terms of where you are now - see what you can do to move forward and don't spend too much time looking back.
I know but its easier said than done and thats another thing that I think has been contributing to gerd is all the worry and stressing about
silly little things, I am trying though