2004 LEXUS GS430

I PUT MY CAR IN REVERSE WHILE COMING OUT OF MY DRIVEWAY AND THE CAR WENT OUT OF CONTROL. I TRY STEPPING ON THE BRAKE AND IT WONT STOP CRASHING INTO A PARKED CAR AND A TREE. IT CONTINUED TO MOVE AN WONT STOP. I THEN HAD TO PUT THE CAR IN DRIVE AND IT TOOK OFF LIKE AN AIRPLANE AGAIN NOT STOPPING WHEN I HIT THE BRAKE. I THEN HAD TO PUT THE CAR IN PARK IN ORDER TO GET IT TO STOP. I AM SCARED TO GO INTO THE CAR BECAUSE I DON'T THINK IT SAFE FOR ME AND MY KID ... PLEASE ADVISE.. *TR

Mileage: 75,000