I called

OK, so I called and left a message for my neurologist. I don't know why I am hesitant to do that. She always says that it is better to contact her through e-mail but sometimes she doesn't answer me and other times she answers right away and I cannot figure this out. It bugs me because why does she think I'm telling her? Just to tell her? I really would like an answer even if she just says wait a week and see how you feel. Just some acknowledgement that she has seen the e-mail. Give me something.