How To Treat Pain In Forehead Due To Hitting?

Hi, I'm embarrassed to type this, but after a row with my partner, I was crying so much that I ended up hitting myself on my forehead, with my knuckles, just below my hairline. This was 2 nights ago, and I have suffered from a headache all day today. It faded with paracetamol but has come back. Should I be worried? Thank you.