How long for healing to start?

Look into the alkaline diet and eat only organic foods. Foods that are not organic contain preservatives which are, you guessed it, acidic. I did not realize this until recently....wish I knew 6 years ago. I dont think it is enough sometimes to just stay away from the identified trigger foods. Try modifying your diet more, manage stress and try chewing non mint chewing gum. Also eat small meals instead of large ones.

You should have seen at least some improvement in symptoms after three weeks. Sounds like you need to do more to keep the acid away from your throat. Instead of a wedge pillow at night, put blocks under the feet of the headboard. You want to be inclined, but not bent at the waist. Elevate it as much as you can tolerate, 8" or more.

You might need a higher dose of the PPI medication. You can try boosting it and see if your symptoms reduce, then over time fine tune what dosage you need.

You should avoid stress and worry since they don't help anything and just make more acid. Avoid exercising with a full stomach, avoid bending over, avoid clothes that are tight around the waist, etc. Basically think of anything you do during 24 hours that might be pushing acid up to your throat. The hard part is the symptoms usually show up long after the acid exposure is happening, so it's sometimes hard to connect the dots.