Oh no Tuffers!
Thats not good news but rest assured it is going to be ok, you just have to adapt, Carl has AS (arthritis in his spine) and I have arthritic stuff amongst other stuff and Im only 24 and whilst its bloody awful and hurts like hell there are ways round things.
It'll be hard to begin with and its certainly not news you want at any age but all will be well - now you have a diagnosis they can start making you feel more comfortable and you can move on with your life.
All the best Tuffers!