The endoscopy seems scary. And I am a bit concerned that the meds stopped working, meaning, did my acid got worse, or do I have something worse going on now?
The endoscopy is truly no big deal. You might read through some of the other threads about that topic to get a sense of how many people don't feel or remember a thing from their endoscopy experience.
As for the meds not working, it does happen. Sometimes it just means that you need to be switched to a different medication, but in many more cases it's because the meds make people feel better for a while by cutting the production of acid and letting the body heal, but you really have to make and stick with the lifestyle changes that help minimize reflux in order to keep reflux under control.
If you've made lifestyle changes (avoiding trigger foods, elevating the head of your bed, eating smaller meals and not eating for 3 hours before bedtime, etc.) and the meds stopped working it probably means that you just need to be switched to something else. If you haven't made those changes you should talk to your doctor about them because they will help the meds to work much more effectively.