Still Sick!

OK I'm really upset about the prescription medicine that the doctor gave me yesterday because apparently it was supposed to heal both my cough and my stuffy nose and it still hasn't worked. I took 2 pills last night and nothing has happened. And I'm not allowed to take any other medicine because this was supposed to do the trick, which obviously it didn't. I'm sad. So today I'm also upset because I have a piano recital today and I really don't want to do because I'm sick. This is really annoying because my mom is making me go and I don't want to go because I have to play a really easy piece that will make me look stupid. And my teacher is playing the advanced duet part of it and that will make me look even more stupid. How am I supposed to get out of this??? But on the bright side, the last day of school was today and now I'm on break!!! At least I can look forward to Christmas Eve tomorrow. Bt I just don't want to play the piano with a really stuffy nose and my teacher expects me to sing the song I'm playing with her too. NOT HAPPENING. I have a sore throat and a stuffed up nose. How am I supposed to sing??????? HELP!