Hey I know how you you feel.
I met a beautiful and intelligent girl on the weekend. She seemed very interested in me. Everything was going well throughout the night conversational wise and every now and then I would get stumped on what to say or ask her. At times I thought I was boring her. Finally I built up enogh courage to ask for her number she gave it to me and asked me to call her the next day. (today) I still have yet to call her because I don't know what to talk about and i'm afraid of screwing things up with her. Any other suggestions on how to deal with this anxiety????