What does your dr say? Your post shows how frustrated you are. What happened 9 months ago to trigger all of this?
Have you tried eating VERY VERY bland foods and very little food?
It may seem like I am dismissing your pain and suffering, BUT that is definitely not what I am saying.
Drs have tried to blame many of my symptoms on GERD.. I don't have it. Sure I do once in a while but, for me, it's a symptom not a disease.
I have Celiac disease and Primary Sjögren's, and a million other issues. I mention these to explain that I eat a very very bland grazing diet. I'm in a recurring phase where water (filtered, bottled, hot, cold, etc) causes extreme nausea. Don't know why and I don't even bring it up to the doctor, it seems to give them more ammunition to blame it on mental health issues.
My diet consists mostly of: rice crackers, 7-up, some electrolytes (but must be Very diluted), meal replacement shakes (my daughter has done tons of research on them, so I can trust using them), gluten free English muffins. You get the idea.
I have learned that I have to read the imaging reports, myself, very carefully. Then research the internet myself, Then ask questions. For example: I had a CT scan w/contrast to prove that my two prior X-rays ( showed partial small bowel obstruction forming) were wrong. But the CT reported issues with my pancreas and that I have a redundant splenic flexure. NOT ONE DR mentioned these issues to me. I am 65, and I stayed with the same GI for 17 long painful years. He was great for the first 5+- years...after nothing he had me do worked, he just strung me along. Drs don't like to have patients with problems they can't easily fix and get praised for.
I really understand the frustration you're feeling. If prior to 9 months ago, you were feeling fine...my humble opinion would be, see a different doctor, now. I wish you well. Shelley

Hi. Have you looked into trigger foods or substances? It took me over 1 year and after adopting FODMOP foods to discover that any substance containing anything ending in "ol" is a killer for me. E.g., sorbitol, erythritol, etc. And fructans. Not fructose--fructans. Take a look at the ingredients in that French dressing. Chances are there may be a bad substance for you.

I had similar issues in 2021. Eventually had my gallbladder taken out. There's a test to evaluate how efficiently your gallbladder is working.

I feel for you . I’m 11 years in . Chronic & daily . Many bad symptoms, many diagnoses, many GI Dr’s , tried it all ! Everything under the sun . Even Mayo Clinic Dr and testing .
Functional medicine Dr ‘s . Diets , you name it . My gut hates food and churns non stop , over 1000 deep wet gross belching daily .
Diarrhea, nausea now and some vomiting. It’s like ok , now what ? This is a horrible life .

If your mild chronic reflux esophagitis wasn’t properly treated and healed from 2-1/2 years ago, it may have progressed. You should maybe consider getting an updated EGD. Any increase in your Z-line dimension from last time will indicate if the esophagitis is still there and if it has progressed.

An EGD will show if your stomach or esophagus is ulcerated or inflamed. Typically, a gastroenterologist will also sample any suspicious tissues and have it sent to a pathologist and they will test for H. pylori at the same time. Not getting an updated diagnoses leaves you at risk for developing Barrett’s esophagus which is a precursor to stomach or esophageal cancer.

At any rate, follow a low acid diet, eat small portions, eliminate NSAIDS, coffee, alcohol and other irritants, don’t smoke, don’t lay down after eating for at least 3 hours, use PPI’s and other acid reducers judiciously until you get to a gastroenterologist.

BTW, have you been tested with a FOBT (fecal occult blood test) to see if your have any GI bleeding?

Update on this post.
I now have a 8mm IPMN on my cyst and EPI.
I’m almost certain now all my GI symptoms are coming from my pancreas.