Hi,
Have you raised the head of your bed? that can help. I think they suggest 4 inches.
Check on
www.mayoclinic.com under acid reflux or GERD.
I had it at the start of the 3rd week of radiation - I woke up with my esophagus and the whole front of me feeling as though it was on fire. My husband made me gulp some Maalox liquid which helped and of course I sat up and read after that since lying down aggravates it. The next day the radiologist gave me something like a Maalox. My husband likes Inexium not to be confused with Nexium for his heartburn and also just plain old liquid Maalox. Be sure to stand up or sit up when it comes on and don't eat acidic things at night.
good luck.
sarah