Do i have a concussion?

5 days ago a backpack with a metal canteen filled with water hit on the right side of my forehead from about 8 feet above me. I got hit directly with the canteen because it was on the outside of the pack. It hurt really bad when it initially hit me, and it sort of felt like my ears got clogged for a few seconds. Then it went away and i just had a huge bump. The bump only lasted an hour or 2. But since then ive been having these headaches. There not that that painful, just uncomfortable, there in the front of my head, they always happen like right in the middle of my forehead and sort of behind my eyes. Does this mean i probobly got a concussion? Will these headaches go away?