No prescription acid reducers seem to work. could it possibly be that there is too little stomach acid in me? apple cider vinegar seemed to help.

There is: An entity called alkaline gastritis, which is caused by bile backing up into your stomach. Treatment is different from acid reflux. Consult your GI specialist for evaluation. You might need to have endoscopy for accurate diagnosis.

Need more history: Your doctor is the best source for this. Vinegar buffers the acid, so it is a temporary fix. There are many prescription medications for reflux and you need to review with your doctor. Sometimes, there are more issues (hiatal hernia, h pylori, etc) that could be causing your problem.