I hit my head. How do I know if it is serious?

At around 10:30AM yeserday I hit my head fairly hard while getting into my car. It hurt for a while and still hurts a bit but I have no current nausea or vomiting or unconscious or memory loss or anything, however I have heard that even minor head injuries could be damaging. My mother and I do not want to waste... show more At around 10:30AM yeserday I hit my head fairly hard while getting into my car. It hurt for a while and still hurts a bit but I have no current nausea or vomiting or unconscious or memory loss or anything, however I have heard that even minor head injuries could be damaging. My mother and I do not want to waste time and money with a doctors office visit that is just because I am worried. It is currently 5:07AM the next morning after I hit my head and I havent slept as I am worried.
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