Brief Answer:
Doesn't sound like a concussion

Detailed Answer:
Good afternoon. My name is Dr. Saghafi and I am an adult neurologist in XXXXXXX Ohio, USA. I see and treat many patients with severe head injuries and concussions and can tell you that from what you've described I do not find very overwhelming data to support a diagnosis of brain concussion. Having said that it really is an individual's threshold for what they feel like after a hard blow to the head vs. what they USUALLY feel like which should determine whether an ER or physician visit is warranted or not. It's easy when there's nausea, vomiting, double vision, and loss of memory. It's more dicey when people hit their heads HARD but are not really dazed, lose consciousness, or have significant broken bones such as noses, skulls, or jaws. Then, people are not quite sure if they should still see their doctors or not.

Again, it's an individual's decision as to how they feel vs. how they USUALLY FEEL. So in your case if there is numbness over the area you struck your head then, that could be a perfectly predictable minor injury that I would say is likely to go away in a few days to a few weeks. But if on top of that there are headaches, blurred vision, slowed thinking, being just a bit forgetful, having trouble falling asleep, etc. then, I think the plot thickens.

If you've already passed the first 24 hrs. since the conk on the noggin then, you are much more likely to be alright than, if this just happened a few hours ago. You can put some ice over the head where you struck it and do that a couple of times per day and it'll keep swelling down which could be in part due to some mild numbness.

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