I remember the first time I tried to swallow a pill. I think I was probably close to my teens, and it was a relatively small one. But I was convinced I was going to choke to death--but finally got it down. Now I can take a whole big handful in one fell swoop. (Okay, no snide remarks about my having a big mouth!) Occasionally I still get a bit choked, too.
Yes, make sure it doesn't seem to be down in your lung!