I've gotten 3 concussions in the past 2 months from sports. This time the headaches and dizziness and inability to concentrate in school seem to be much more intense then the other 2 for some reason. They're so bad that I almost passed out during one of my final exams. I feel pretty much fine until I try to read or do math. Is it normal for the symptoms to be this bad when will this go away and is there anything I can do to make school easier for me until this goes away?