Chills, feel sick, can't sleep?

so for the last 3 days or so i've had chills, i'll be freezing with 2 blankets on and then an hour later i'll be sweating, i'm not really eating anything but i'm drinking fluids (juice, water). I feel like i'm going to throw up every now and then but never do. i'm also having a lot of trouble sleeping, i toss and turn and when i fall asleep it's only for a few hours, i'll wake up shivering or sweating. is it the flu or could it be something more?