i can't help, only sympathize. I have something similar to this, but it doesn't happen all the time. It usually happens whenever i take tablets and every couple of weeks while eating. I think it would happen more whgile eating except i am now very strict about swallowing tiny amounts and washing it down with lots of water.
For me too, I previously didn't vomit either, but now it just happens spontaneously with no warning. its happened when i'm eating out with people and is embarrassing and frightening.
it's the same with the tablets too. I used to be able to swallow large capsules with no problems. Now I have to cut a normal tablet into four pieces to avoid that horrible burning feeling in my throat.
I'm a 23yr old female. I went to the doctors a couple of years ago, and had a barium swallow test, which showed nothing unusual. The doctor dismissed it and told me to eat slower and chew more, which i found very inadequate advice. I'm going to get a referral to a ENT, as it seems GPs aren't going to be much help with this.