Well... I don't really know anything about this. My poor head has taken a beating over the decades beginning when I was still a very young child. (I'll spare you the details!) (Plus, 2 or 3 years ago I guess it was, I also bounced my head off concrete in the process of falling off of my bike.) My inclination would be to say these sorts of "insults" simply take time to heal. But then, since you have a seizure disorder, that does add a potentially complicating factor to the whole situation.

The one other thing I can mention is that there are members, over on PC's sister website: "NeuroTalk" who are knowledgeable with regard to concussions. So, should this continue to be a problem, (assuming you're not already a member over there) you might consider signing in to see what those members can offer. Here's a link to the NeuroTalk website:

NeuroTalk Support Groups