I went through a period of time, for several weeks actually, BEFORE I even knew I had MS. Food would stop mid-swallow. I was working at the time and would have to hurry to the bathroom because the only way to handle it was to get it to come back up. Because it wasn't going on down.
I didn't know what was going on. So I would take tiny tiny bites, thinking I was just getting in a hurry trying to eat too fast.
But now I realize I was in a relapse. I haven't had that problem since then, thankfully.
I am sorry you are having this problem.

I hope it gets better soon.