I have been a survivor of Esophageal cancer since 2006. I had the Transhiatal Esophagectomy which renders the sphincter valves useless so they remove them leaving a direct path up to your throat. I tried the wedge pillows for a while but always ended up slipping down and having aspiration that was always a horrible experience especially if it got into your lungs.
I eventually got my insurance to partially pay for an electric adustable bed that you could adjust head and feet. I got my doctor to write a perscription for it, claiming it as a medical necessity. It is still an occasional issue since I move around alot at night. I had to learn to sleep mainly on my back with the legs slightly raised so it would put me in a slight valley that would keep me from slipping down at night. If I don't raise the legs up, I tend to slip down a bit but I have learned to put my arm under the pillow which helps keep it under my neck. I wake up at night and if I have slipped any, I reposition myself. It is quite an adjustment but after some experimenting, you will find what works well for you.
1. I really suggest that you look into an adjustable bed frame. That has worked well for me.
2. Be very carefull about drinking or eating anything 2-3 hours before you go to bed or lie down.
3. Avoid foods in the evening that are hard to digest and create acid buildup like meats, etc.
4. Buy a wedge that you can take with you when you go on a trip or have to stay overnight somewhere besides your home.
Good Luck. Be Well.