Then one day I had a fever of 104.7 degrees. I probably should have gone to the doctor, but I'd never really been sick in my life, and I knew that usually, if you have a virus, you stay home and you make some chicken soup, and in a few days, everything will be fine. But this time it wasn't fine. After the fever broke, for three weeks I was so dizzy, I couldn't leave my house. I would walk straight into door frames. I had to hug the walls just to make it to the bathroom. That spring I got infection after infection, and every time I went to the doctor, he said there was absolutely nothing wrong. He had his laboratory tests, which always came back normal. All I had were my symptoms, which I could describe, but no one else can see. I know it sounds silly, but you have to find a way to explain things like this to yourself, and so I thought maybe I was just aging. Maybe this is what it's like to be on the other side of 25.