Headache

I've had a headache since Saturday. I went to the doctor yesterday and got some migraine medicine, but she said since I have waited so long it may not work. I don't have a headache this morning, but the kids ARE gone to school. I feel like it could come back any minute. So, I'm trying to decide whether or not I should go on to the ER. I'm waiting for the DR to call me back. Please pray this goes away quickly. I really don't want to miss my wedding this weekend!