Welcome to Healing Well!
I'm so sorry to hear you're having such trouble! It seems so strange that these symptoms would start after a fall. The first thing that came to mind was that perhaps the fall created a hiatus hernia or increased one you may have had. It's just a guess, but since it happened after a bad fall, it makes send to me.
If I were you, I'd try to get your doc to order a barium swallow. It would check to see if everything looks normal, and you could rule out a hiatus hernia with that test.
On the other hand, if the meds are working for you, you might want to give yourself more time to heal, and see if you feel better. It does take time for the meds to reach full effectiveness (two weeks) then it will take time after that to heal.
If you got a headache with the fall, and took NSAIDS for pain, they could have caused your stomach problems that could have started things going.
If it takes a long time to get in to see a GI doc, you might want to make an appointment, then just cancel it if you get better before the appointment. Just a thought.
Good luck! I'm sure others will be by to offer their support and ideas.