Came across this post as I seem to be having a similar issue. As the pressure builds up I sometimes burp but no burning sensations, just annoying stuff. Anyways looking at the anatomy the esophagus it kind of travels in behind the heart and lungs, so any laying on my back seemed to worse it aka going to sleep at night. I've found some relief from laying on my stomach, head on a pillow (try not to activate any neck muscles. Do this for around 10-15 min or until you get relief. I wiggle around every now and then, use bug breaths here and there and basically just use gravity to take pressure off the esophagus. This is not a tried and true method just something that I found helped me. My esophagus went crazy and got a lot of burps out so just ride the waves as they come. I also read some about cricopharyngeal spasms on Google and it shouldn't be anything to worry about but its definitely an annoyance. Hopefully this provides some relief for y'all.
I too have a problem of blocked burp feeling and it results headache especially if I sleep right after meals or eating anything. I just want to share my simple remedy from my experience that helps me expel burp.
I found the easiest way to release the burp is to place both your hands at the back of your neck near the skull and do gentle massage while keeping your head/neck straight up. Doing this in standing position is better.
The other thing you can do at the same time or separately is to move your shoulders backwards and towards the center of backbone/neck.
I am a software developer and realized that this symptom is caused by constant tilted position of head towards monitor/laptop causing strains in your neck muscles.
I don't know the scientific reason for it but this helped me a lot to get relieved from burps and my headaches are very much reduced. Before finding this, I used to walk a lot after meals and before going to sleep in order to avoid headaches.
Also, this is analogous to newborn babies who need to burp out right after feeding otherwise they get very uncomfortable and cry. A gentle massage on their back and neck with their straight up position helps them release burp.
Please try this simple and effective remedy and let me know if it helps anyone.
What I'm going to do is cut out carbs completely for a few days and see how I feel. A low-carb diet is recommended to make your stomach acid normal again (please research to know why that is, it's very interesting) and I will be back with results for people who are still looking for answers.
http://en.wikipedia.org/wiki/Cricopharyngeal_spasm
almost for sure this...i have the exact feeling, which when googled brings this up.