question: I had an automobile accident on May 9, 2013.  Progressively I have had a constant light headedness and pressure on the left side of my head, where I hit the door jam.  There is a numbness on my left cheek from the ear to the chin.  My vision at night is extremely blurry, and blurry in the daytime - just not as bad.  My family is worried.  I went to the ER and they did a CT scan.  I followed up with my doctor and he said that there was a slight prominent ventricle that could be hydrocephalus.  My doctor said he is not worried because my symptoms aren't bad.  I don't have trouble walking and I haven't lost control of my urine.  My family is worried at how non urgent the doctors are reacting.  I want to know if the lightheadedness doesn't subside when should I consider a second opinion?