Hello Aoide, I'm sorry to hear that your going through this.
It seems that you've been trying a few things already, and I just wanted to say that yes, sometimes the protocols require a little time before you start healing. Yet, there are a few other things you can try to improve more quickly.
I made a quick search and found a comprehensive article on the subject by Cris Kresser which includes some suggestions (some of which you may have tried already):
While the symptoms of GERD are disruptive, the risks of the drugs used to treat it can be more distressing. Find out how to cure GERD without medication.
chriskresser.com
From what I can see, the treatment is similar to the treatment you would use for other gastric issues, so... I'd like to add another suggestion that has always been helpful for me when I have gastric issues: eat chicken/meat soups and bone broth.
When I had very bad gut issues, I tried lots of things, and although they all helped to certain extent, a functional doctor once told me to eat chicken soup everyday, so I did it and that was the moment when things finally seemed really start healing for me. I took it very seriously and ate only soup for a couple of moths, chicken soup mostly, but sometimes I added meat to it as well.
There is a protocol called
GAPS diet which recommends this approach with very good results and the reasoning behind it seems to be that soups provide easily absorbed nutrients that help heal the lining of the digestive system while giving it some rest because they are very easy to digest, so you kind of give your digestive system some time to heal while feeding your body with lots of nutrients.
According to the GAPS website, "Meat and fish stocks provide building blocks for the rapidly growing cells of the gut lining and they have a soothing effect on any areas of inflammation in the gut."
According to the Weston A. Price website, "Stock contains minerals in a form the body can absorb easily—not just calcium but also magnesium, phosphorus, silicon, sulfur, and trace minerals. It contains the broken down material from cartilage and tendons—stuff like chondroitin sulfates and glucosamine, now sold as expensive supplements for arthritis and joint pain."
It may sound like a difficult protocol to follow because you'd have to cook soup everyday, but, if you have a big enough pot you can make a lot of soup once or twice a week, freeze it in portions and eat it throughout the week without having to cook it everyday. Also, if you don't tolerate high fat at the moment, you can make your soups without too much of it at the beginning. If this works for you, you'll be able to tolerate more fat after some time.
Finally, just a small observation. Regular chicken can be full of toxic antibiotics and hormones depending on where you live, so if you can get it from a good organic source, it will definitely be better.
I hope you can get better soon!