Grab some books on GERD or check out the internet medical sites. Start reading and see what you can find out. Doctors just don't have all the answers. Not to mention they don't have the time they once had to focus on just one patient. We can thank insurance companies for that one! Compare your symptoms to what you read. You may be able to find an answer your doctor never thought of. I have several health problems and each time I'm diagnosed I "hit the books".
If these meds aren't helping, by all means you should try something else. They aren't all alike and they don't all work the same for all people. Ask your doctor for the cheaper medication and work your way up the price scale if that doesn't work. Also, if you can, check around with different pharmacies. You'd be amazed at the price differences!
I also have to take medications for the rest of my life. Not a pleasant thought but I do SO hate pain! Trial and error is the only way to find an answer to some of our health problems. It's not cheap, that's for sure, but it's the only way.
~~IF WE CAN'T LAUGH, WE CAN'T SURVIVE~~