I hit my head fairly hard this morning while I was opening my almirah to search for something. There was no bleeding and the exact spot where I hit my head does not hurt much, but since then I’ve been feeling dizzy and not quite like myself. I have mild dizziness, a strange “off” feeling in my head, and slight pain at the back of my head (even though I didn’t hit that area). I could not study for more than 1 hour because I was feeling "off". Is this normal? Do I need to rush to emergency? I didn't have any blackout or vomiting..