Well, the whole cortex works with memory. The frontal lobe, where I'm assuming you were hit, is connected to emotions.
If it's actual brain damage, it is perminant. Neurons can't be fixed (repaired to some extent, though).
Anyhow, i'm sure it's just a minor thing, and you should do alright sometime soon. If it becomes a concern, see a doctor.
Keep us up on what happens!
As always- None of my statements are evaluated by the FDA.
My advice is not intended to diagnose, treat, cure or prevent any diseases unless prescribed by a health practitioner. All information is provided for educational purposes only and should not replace the advice of your medical doctor.
(but your medical doctor will probably end up killing you