I wouldn't trust it. I still think you should get looked at. Back in the 80's I had a buddy by the name of Kelly Williams (yes a guy), had a dirtbike accident, went down pretty hard, full gear. Had headaches speradically for awhile, then seemed to go away. Never thought anything of it, then started getting headaches again, got looked at, said ok, (back in 80's), told him prob stress. 6 months later we put him in the ground. Went to sleep and never woke up. Keep in mind we we're 17, young, TOP physical condition and well taken care of.
Like I said brother, I just don't trust minor head injury, we lose enuf brothers in uncontrollable bad situations, but if we can attend to a minor situation and be sure, I know I would sleep better. God protect you.....