Sorry to hear this news.

I know a guy that got the same thing as you in 1968, at about age 15. He survived, has had a good life, and is still alive and well. The treatments available today are FAR superior to what they were even 15 years ago - so keep your spirits up, follow the doctors' advice, and the chances are you'll get through this and come through OK. It may be worth seeing a therapist for a while just to help keep your balance during this. They can teach you techniques to deal with it. Keep us posted, and good luck.