Have I got a touch of the flu?

Last night, I woke up at about 3.00am shivering like mad and feeling like I'm going to be sick. I've been feeling really tired and have had a headache for ages. I'm lying down next to the fire with a thick quilt over me and I'm still cold. My muscles are also aching too.I can get out if bed and everything so I know it's not serious. I have originally been off school for having bad period pains but woke up shivering last night and had hardly any sleep so I stayed off again today. I've been trying to drink a lot to keep hydrated but don't feel like eating at all. What's wrong? Haha.