2015 Subaru Forester brakes problems

While backing up a winding hill on a hard packed gravel driveway I backed into a seven inch diameter tree on the edge of the road. Did not hit it hard enough to damage the back bumper. I put the car in drive and in an instant the motor went wide open. I hit the brakes, but no noticable effect. I narrowly missed the corner of the garage. The car dug four depressions in the driveway when it took off. And threw gravel all the way down the hill and on the flat until it hit a large tree, the motor still racing.

I started driving and found that my hill holder, my vehicle dynamics control system, my ABS, my subaru eyesight and multiple other warning lights were all lite up. I pulled over and turned off the car and when I restarted the car I couldn't put my car into gear. It was stuck in park on the side of the highway. After a few more tries I was able to get it into gear and continued driving with all the warning lights on. This problem occurred multiple times yesterday as I attempted to get it to the dealership.