I have a 1992 model Nissan and the car runs pretty rich- (gasoline smell from the exhaust is pretty strong) I was driving and I suddenly started to get light headed and got a weird taste in my mouth. This of course lead to over thinking but I started to get extremely light headed so eventually panicked, pulled over and got out of the car where my heart was pounding so damn fast and I was on the edge of passing out ( or I felt like I was going to)
 
Fast forward a couple hours later I don’t have a headache or nausea or any serious Carbon monoxide poisoning symptoms. However it was a unpleasant experience and left me a bit traumatized 

FYI .Yes I do have a history with anxiety and panic attacks