Fell and bumped my head, went to the doctor, should I still be paranoid?

Monday I tripped on a suitcase, fell and bumped my head on the bathroom door. I had no major symptoms except for a small bump that has gone down and some light headedness, however, I went to the doctor to get checked out. She checked my head, neck and eyes, asked about symptoms and said she thought I was fine, but to let her know if I had any other major symptoms arise. I have still been a little lightheaded but mostly while at the computer at work all day. No nausea, vomiting, blurriness, loss of consciousness or headaches. I did a follow up call with the doctor yesterday and also let her know I had started my period, which she said could also be causing the light headedness. I honestly think I have read too many crazy stories online and articles about Natasha Richardson. I have hit my head harder in the past, so I'm not sure why this is making me so paranoid this time.