Car Accelerates On Its Own problems of the 2008 Chevrolet HHR

Vehicle in mention, chevy Hhr 2008, sudden acceleration going down freeway reaching 80 mph. Rpm's went up to 6 and stayed for over 7 minutes. The vehicle almost hit another vehicle in front of me due to no where for me to turn. I slowed the vehicle down by engaging neutral and continue breaking. The breaks were pushed to the floor. My right foot was immediately taken off when sudden acceleration occurred. I did not have many options on a two lane northbound freeway 101 in northern California. I could turn to the right and go down an embankment or turn left and hit median and another vehicle or keep going forward and ram the vehicle in front. The car was still accelerating in park when I finally stopped. The engine was still revved up and rpm's at 6 still. I did turn car off and started again and car was still revved up, very loud engine noise. Tried reverse and car engaged in reverse fast. I turned vehicle off again and called tow truck.