My girlfriend sometimes doesn't understand what I'm going through and says some things similar to that. Sometimes she will laugh at something I do because of my symptoms, like we were at the grocery store and I left the 4 month old son who was in the stroller on one of the aisles and started walking to the next aisle lol, she was like NICHOLAS! THE BABY! And she started cracking up. I'm glad one of us has a fully functioning brain.

How long have you been having symptoms? Maybe it really hasn't settled in with her, or maybe she isn't educated enough on your condition. You should do what nightnurse30 suggested and show her those videos and also have her do a little research on PCS/TBI. Most of the documents online give a rough estimate of how long the symptoms last. I'm pretty sure once she reads about it she'll be more understanding.

My mom has done a lot of research on what I'm going through and she understands completely. She's the one I go to when I need someone to talk to.

I hope everything works out for you.