Do I have a concussion?

About a week and a half ago, somebody kneed me in the head a trampoline at a party. I was really dizzy for a while, but I didn't think much of it. Sunday, I fell over twice and couldn't fall asleep because the room was spinning. Tuesday, my contacts were bothering me, particularly my left one, and the left side of my head began to really hurt. I had a migraine soon enough and went to sleep early. Today, I did not wear my contacts and struggled through a history exam with half a migraine...I fell over once this morning but I haven't too much. Now, the sides of my head are hurting. When I woke up from the nap I forced myself to take today, the back of my head hurt. It felt like my skull hurt. I don't think I have a concussion -- it's an attention grabber for people to answer this question --, but could something be wrong with me? If this matters, it's very, very hot and humid where I live right now.