The same thing happened to me. I got a concussion playing soccer -- a corner kick. I went to the trainer/nurse because I was worried I felt dazed and had a strange headache. She performed the concussion tests, said I was fine enough to return to play the next day. The next day we were practicing header's, and after practice, I got a splitting headache, worse than any headache I had ever had before. I went to the doctor, and he told me I had a concussion. I have never stopped worrying that I had second concussion syndrome. To this day, I feel resentment towards that trainer, the person who was supposed to inform me -- a dumb sophomore who had barely even heard of a concussion -- of the risks of returning to play after a concussion scare. I may never be the same person because of her. I feel that I will never be able to function normally ever again -- won't be able to perform in school, won't be able to focus, won't be able to socialize with other people, won't be able to fully recover from the anxiety/depression I now have to take meds to control.