Hi breea,
Hopefully someone who has had the same type of surgery will reply to your post in the Spinal Forum.

I just did a search in there for "reflux" and a number of posts came up, but they didn't have too much information in them to help you.

One tip if you're experiencing the burning feeling only at night is to raise the head of the bed.

I hope this resolves for you once the swelling from the surgery goes down.