There are two injuries that occur during a concussion. First there is the impact force that can do damage, but as others pointed out, that's not likely, so don't worry about it.

The second injury is the inflammation that the brain produces in response to the impact and it's that inflammation that causes the symptoms. Inflammation has a beneficial role in the beginning, but prolonged inflammation is bad. Anxiety can also cause the brain to produce these inflammatory compounds. So you can have concussion-like symptoms without a forceful impact.

So take Curcumin and Fish Oil, both of which are anti-inflammatory and neuroprotective. Then rest and relax for a couple days to allow the inflammation to subside, then gradually resume your previous activity level.