My Volvo S80 is having a surge of power when I accelerate. Once I pass 15mph the dashboard and headlights get very bright and my power window buttons will not work until I lower my acceleration. It got so bad that my headlights blew out when I was going about 20mph. Also, some of the lights on the dash eg: brake, check engine, service, go turn on when I accelerate and then they stay on until I turn off the car. Any suggestions will be great help, before I take it in I want an idea of what to expect.