What Causes Discomfort And Swelling Of Adam's Apple?

Hello, about two hours ago while removing my shirt I hit my adam's apple relatively hard with my hand, accidentally of course. Since then I have been extremely uncomfortable; my adam's apple feels like it's out of place and larger than normal. It's like I'm constantly on the verge of burping (but I have actually burped and it doesn't help). I have no serious pain, and I am breathing, eating and drinking fine, but it's incredibly strange and worrisome and uncomfortable. I am on the verge of visiting the ER. PLEASE HELP. (4 yr. smoker)