Welcome Sarabi; my symptoms were atypical, but this is new for me. I have back issues..herniations, cysts, spurs, arthritis; I never correlated back issues with anything else. Could you have twisted when you woke up with the reflux? (I'm grasping at straws here!!) Do you see a chiropractor? Perhaps they can help?
I hope someone here has better answers than I do! let us know how you're feeling.