I had extremely bad reflux before my RNY, and for the last 6 months bf surgery I had this problem at least 2x/month. I know what a terrible feeling it is to wake up with your throat and up into your mouth on fire, it even makes it hard to breathe, and takes esp. long to go away so you can sleep...I feel for ya! Since you are getting the vsg, you might have reflux for life, albeit maybe improved. the only medication that worked for me was Nexium daily. I tried them all. It can be more expensive since there is no generic, but it is soooo worth it! If I was dedicated to taking it everyday, I never had any "break-thru" reflux. Also, if you are eating any of these items, STOP NOW... caffeine, alcohol, carbonated bevs, bev w/ citric acid added, tomatoes(sauce included), bananas, simple sugars.
You are very close to surgery, so taking meds can be dangerous. I would call your surgeon's office and ask them for a Rx for Nexium for 2-3 days, just make sure they double check with your anesthesiologist for an OK!!! Very important!
Or you could pick up a bottle of apple cider vinegar and drink 2 tablespoons before meals. It's not the most pleasant taste, but does help a lot, only costs about $2, and you could probably use it up until surgery since it is not a med(again check with anesth). Mixing in some artificial sweetner or agave, and cinnamon , makes it taste more like cider which helps with the taste.