It took about 6 months for me realize that something wasnt right. Saw neurologist for headache and fatigue,it took Dr 3 0r 4 more visits and other symptoms like dizziness,concentration problems, fogginess for Dr to actually label it PCS. My symptoms seem to go in a 6 week cycle,dizziness for a while then concentration problems and so on. Symptoms real came out after 6 months or so, That i noticed. Car accident was aug 0/8 still have symptoms.