Aside from an immediate headache, blurred vision and nausia, the rest of my symptoms gradually started the next evening. For the first week I felt as if I was on some really strong cold medicine (very spaced out). I didn't actually know I had a concussion for 4 days after the accident. The Emergency Department said contusion, the work doc (4 days later) diagnosed concussion. The hard part was that no one prepared me for the cascade of symptoms that I could expect to come. I thought I was going crazy with each new issue. Strange how you can feel so unlike yourself. Glad I found this place!