Like all 250 TV channels in my head are on at the same time and turned up loud.

I was 53 before I learned that most people have an "OFF" switch in their brains. I've had racing thoughts all my life and never knew there was anything different. But when I'm manic, they simply go at Mach II and ping-pong around uselessly inside my head---there's no putting together anything even remotely coherent. The harder I try to grab at one or two, the more they skitter away from me, leading to frustration and sometimes explosive anger.