I am on 150 mg of Toprol XL daily for about 2 years. AFter I star...

I am on 150 mg of Toprol XL daily for about 2 years. AFter I started on the Toprol within 3 months I noticed my hair was much thinner. I did not associate the two until the next time I saw my beautician, and the first thing she asked me about was if I was taking blood pressure meds. Her experience with many heads of hair had given her this knowledge. I have found others who say the same. My doctors say they have never seen hair thinning as a side effect. Does everyone have to go bald before this is acknowledged?