Hi, I work for a major home improvement store, & about 8 hours ago, I hit my head on a metal beam (heavy shelf). There was no bleeding, and I immediately put ice on it. I began to feel better, a little dizzy at times, but not too bad. About 1 hour ago, I began to experience nausea , more dizziness , head aches , and my head feels very heavy. Is this normal after hitting your head on those types of shelves? And also, how long should I wait before going to sleep? As it is now 12:31AM.