Have Sore Upper Back, Suspect Acid Reflux. Take Omeprazole For Hitatius Hernia. Cause?

Hi I have had a sore upper back for a couple of months and sometimes feel sick, I have been to the doctors and they suspect acid reflux as I take omeprazole for a hiatius hernia as it comes and goes and I have had a cough for a couple of months, therefore they have increased my dosage, I do sometimes feel strange inside as if i could burp. however if my wife massages my back while i am lying down there can be some rather load cracks from my middle / upper back. not to sure what to make of it all just get the feeling it could by a bad spine combined with something else any thoughts