I've had this problem on and off for almost 10 years. I've tried therapy and drugs and nothing has helped. It has gone away for long periods but then returns for no reason that I can figure out. I think it has a lot to do with anxiety and stress and panic. But it doesn't help to know that. It just makes it more frustrating that it's all in my head. I've had every physical test done with no results. I do have a hiatal hernia and GERD though.
BTW: what happens to me is that every time I go to swallow, it's like my throat is not ready, my tongue pushes the food to the back of my throat by I can't swallow at that time. Sometimes I have to cough it out and then try again.
The only advice I can give is to eat slow, chew a lot, continue chewing right up to the swallow, drink lots of water while eating (sometimes this is the only way I can eat - wash it down with water). If you have no problems swallowing liquids, like me, this is the best way ive found to eat. Eventually you get used to it and forget that you have trouble swallowing.
Hang in there.
M