I was in the same place as you but, once I got serious about changing my diet (and doing the other things my doctor recommended like raising the head of my bed, not eating for 3 hours before bedtime, etc.) I did start to notice a big difference.
I suspect you're right that there's no cure but it can be managed. It's frustrating because one bad decision can cause a flare up that takes days to die down, but it can be managed.
After the endoscopy (which I got through with no sedation) my GI doc was brutally honest with me and told me it would take 2 months to start feeling better IF I did everything he recommended. It hasn't been that long yet but I have definitely noticed some improvement, but it takes way more time and effort than I ever thought it would.
Hang in there.