Tonsillitis can make you feel absolutely awful for a while.
Drink lots of fluids, through a straw if it makes it easier or suck on ice cubes (you can even freeze juice and such which makes them nicer tasting).
Having a soft scarf loosely round your neck can make it feel a bit better.
How is it affecting your breathing?
If you've got a bad virus it can know you out for a while, I had viral pnumonia and they suggested I could have glandular fever afterwards. Test was negative, just took a long time to get my body back on track.
Get lots of rest, fluids and good fresh food (wholesome soups and lots of fruit and vegetables), fresh air and gentle exercise when you can.