Does this sound like a concussion?

I hit my head yesterday night at around 10 pm ( now its 300 pm where I live) and experienced a brief flash of blue, followed my a minor headache and minor head pressure. I did not experience any oother hemmorrhage, stroke, or concussion other than those symptoms. Today, the headache remains, and there is still minor head pressure, but nothing else. No altered mental state, no trouble sleeping or loss of consciousness when I hit my head. I did some research and discovered something called the Luci Interval, however, and now I am worried i have that and am going to get a hematoma or something.