atenolol?

My doc gave me atenolol to try out for a week to help with this blotchiness that I get when I get really anxious. I guess it is a vascular reaction to stress that I get, adn I have been quite stressed. he has told me to try it out to see if it helps, and then once I get used to it to just use as needed if I have a stressful event or something (i.e. my wedding) so that I won't get all blotchy all over.

Is there anything I should know? I have never taken a beta blocker before. He gave me the run down of it basically, but anything that people experience that I should be ready for?

Thanks all