Hello, I fully sympathise with you. I have exactly the same problem. It is so scary. I felt like I was going to die the first time it happened as I couldn't breath as my airway was blocked with this mucous. It just gets stuck in my throat and I can't get it up and then start swallowing to get it to go back down and this is when I swallow lots of air and end up burping lots after too.
I have just been looking online in desperation, to find out about excess mucous in my throat, which feels like I'm choking. I went to doctors and the nurse I saw said to take omeprazole 20mg in the morning as it sounds like acid reflux.
It started 2 1/2 weeks ago with a cough and I was given antibiotics and this is when acid started coming up into my throat. I think it has burnt it as it was sore and very red. My voice was a bit hoarse too. Since taking the omeprazole my throat is not so sore - it is only day 3 of these by the way.
I am due to go away for a few days and am very scared about this choking thing. I have been sitting up sleeping for the last 10 nights and am absolutely exhausted.
Any tips anyone can give me would be much appreciated.