Anyone have much experience with this? Fiance collided heads with the dog on Tuesday and think she had a mild concussion. Been having mild headaches, nausea, dizziness since. Been to dr and even ER had all told us seems like post concussive symtopms. No scans yet. She's still feeling bad and is starting to freak out like possible tumor or something. Anyone familiar with how common it is for these symptoms to persist for this long?