I am 18 years old and I was in a car accident a day ago, where I rear ended a large truck at first I was the passenger and I didn t have any immediate pain, today I feel sore which is normal around my neck shoulders and the back of my arms, I had my seat belt on and didn t hit anything i.e a steering wheel or dash board to my chest but within the past hour I have developed general weakness, fatigue , and complicated breathing/ tight chest. What could be wrong and what should I do?