I'm light headed, vision narrows, anxiety when driving beyond 45mph. Doesn't happen when i'm a passenger. I have to slow down when it occurs,sometimes hitting the breaks nervously. Feels like im gonna pass out. Im on losartan for high blood pressure. Dr's have done blood work, eye doctor didnt see anything wrong, sugar levels are in normal range. I dont have to be thinking about any stressful things for it to happen. Any suggestions?