Body problems of the 2004 Lexus ES330

I was parking my car in the parking lot of a garage when my car Lexus 330 suddenly picked up high speed (full throttle) unintentionally. The vehicle went forward and fell approximately about 5 feet to the other parking level and violently hit the back of a pickup truck which was parked. I had my seat belt on. My body went forward and backward violently. For the next few days I had experienced muscle pain, stiffness and poor night sleep. The accident was reported to the police.