Welcome to Healing Well! As I was reading your post, I came up with the same answer as Joy. While OTC Prilosec is still pretty expensive, it's nothing in comparison of what you'll pay searching for answers via doctors. So give them a try. Typical doses start at 20mg once a day, usually about a half hour before dinner. From there docs go to higher doses, and sometimes even add one in the morning. I'm sure directions are given on the box.
Another thing you can try is to elevate the head of your bed by putting blocks, wood, or bed-risers under the legs of the bed. That way gravity is helping to keep the acid in your stomach during the nighttime hours. Often people have their worst reflux while sleeping, because acid can easily migrate into the esophagus. The bed should be elevated 6-7" to really help the most. Don't just put a few pillows under your head, as they tend to bend your body and put even more pressure on your stomach. A foam wedge can also help, but the ideal fix is an elevated bed.
I'm sure others will be by to add additional comments and support.