What Causes A Sensation Of Something Stuck In Throat?

I took a rather large antibiotic pill with milk and it felt like it got stuck in my throat. I drank another two glasses of milk and it feels as if it got further down, but is still stuck. Originally I felt like burps got stuck, but now I can burp, however it still feels like the pill is in my throat. I'm nervous about it being stuck there and burning my esophagus, I'm also nervous about having to take the pill again (along with a huge capsule pill) in four hours.