Hello, I Have A Problem Sometimes, More Often Than Not,

Hello, I have a problem sometimes, more often than not, when I eat, it goes down my back. My mom used to say it went down the wrong tube. But it doesn't cause coughing, but extremely pain. I can actually feel it going down what feels like my spin, and I stop eating. It seems it will cause or is caused by excess phlegm in my throat or stomach and if I get it out I can eat a bit more, but it will eventually happen again. Why does this happen and how can I get it to stop