Thyroids shedding my hair PLEASE answer?

I saw an alternative med doctor b/c of excessive hair shedding this was a couple months ago. The doc told me my thyroid was very lazy (and other flaws with health as well) and that my body was basicly taking some nutrience it needed from my hair thus helping my hair to fall out. Since then I have really noticed the way my hair seems so thin when I actualy have thick hair. I never ordered the vitamins/herbs prescribed b/c I am interested in knowing 1st will they help the hair that has fallen reappear which will increase my volume in hair or will they just stop they shedding? What can I expect with these vitamins? please inform me if you can..THANKS do you know of this happening with anyone else, what did they do?