My burping started three years ago. One day out of the blue. It is crippling. After a while it makes me feel sick in my stomach. After seeing all of the specialists, etc. with no results, I tried to figure out what was causing it. Sometimes I would think it might be physical, other times maybe physiological related to anxiety or stress. I still do not know.
I thought I would share some of the things that have worked for me. First, I noticed that it wasn't happening when I was eating, so when I would start to burp a lot I would eat sunflower seeds. This works, but there are other issues with eating a ton of sunflower seeds :-(. I also tried just lightly snacking on other foods, but again, not a great solution.
One of my doctors suggested chewing gum. Amazingly this helps most of the time.
Sometimes, it doesn't, but overall it really helps. Lastly, on one of my many internet searches, I found an article on a case study of using hypnosis to treat uncontrollable belching. https://www.researchgate.net/publication/14404330_Uses_of_Hypnosis_in_the_Treatment_of_Uncontrollable_Belching_A_Case_Report
I am a skeptic of hypnosis, but based on how dismal the belching makes me I thought I would try it. I contacted her and had a session with her. The next day was my first burp free day after nearly a year and a half of burping. I was still burping, but there was hope. I was unable to continue sessions because of cost. Now another year and a half went by and I decided I need to get back to trying to stop the burping instead of dealing with it. The therapist/hypnotist sent me a recording of the session and I have been using it for 2 days now and have noticed a big decrease in my burping, which prompted me to logon and respond to these forums I came across in my research, hoping I could help some others. I will post again in a week or so to let you know how it is coming.
Please post if any of these things helps with you and what other methods have helped. I am sure this can benefit many others.