Twice while driving on a highway, i blacked out. first time, ran off edge of road; second time, ran over into on-coming lane. twice, i had major allergic symptoms. first, right after buying car; second, six months later. twice, i grew breathless after driving car for several hours. once, i could not keep my balance after driving car on a highway. all of these episodes occurred after longer than usual drives. normally, i drive short distances around town. twice, an opaque film formed on the exterior of the front windshield, obscuring visibility - once on a dark highway; once on entering a garage. wipers, washer fluid, rain did not affect the film. *tr