I'm looking at this discussion 8 years later, and I still have symptoms. I hoped to be wrong but I wasn't. It is really like my brain has permanently changed. I can't concentrate on anything for more than 15 minutes. After that, I get overwhelmed, overstimulated, whatever, and I have to stop and rest. But sometimes I push myself. Sometimes, I have to, like when I have lunch with a friend, for example. I get so overloaded, I get home and am nauseous, dizzy, and have to lie down for awhile. I don't even need triggers to get like this. It's just a pure concentration problem. My psychiatrist says it's a combination of anxiety, depression and sleep deprivation. Maybe so, but it really does feel like my brain is different somehow. I used to be be able to concentrate on something for hours at a time. I earned a master's degree more than 20 years ago, for God's sake!