On monday i went sledding. when i went down i had went over a 2 ft. slope and hit my head hard on the ground. i've been having headaches since then.

Concussion: You may have a mild concussion, this is common after head trauma, if you start to experience any severe headache, nausea/vomiting, lethargy or other new symptoms you should get evaluated right away. Usually headache may last for a week or even longer. You can take over the counter Ibuprofen or acetaminophen. Avoid watching to much television, video games, puzzles etc..To give your brain a rest.