sukisu,

Welcome to NeuroTalk. Your symptoms sound classic for a concussion except for the shortness of breath. I wonder if you injured your neck, specifically your upper neck. The subtle upper neck injuries common to concussions and car wrecks can cause concussion like symptoms or aggravate concussions. It may help to find a Physical Therapist who is skilled with whiplash and upper neck injuries.

Hope this helps.

My best to you.