Ok, about 4 days ago, I was taking some medicine. It was a capsule that had to be swallowed. I was too lazy to fill up my 1/4 empty glass of water, so I tried to swallow it with just a little bit of water. When I was swallowing it, I had the feeling that it did not go down all the way. It felt like it was stuck there. I went to bed and woke up because of pain in my chest and upper back.
Four days later, I no longer am woken up by pain, and it rarely hurts except when I swallow. I get a sharp pain between my shoulder blades and occasionally in my chest.

I am asssuming it is because of the pill maybe irritating my esophagus, but I don't really know.
Does any body know what it is?
Will it go away by itself?
Or how do I fix this problem?