Do your level best to take this one day at a time. I am sooooo sorry to hear that you are having these problems, especially at such a young age. It sounds like you are pre-disposed to degenerative problems and this situation is not work related.

The surgery will not be as bad as you think. The worst part is the diagnostic stage.........all of that pre-op foreplay. As far as your military career is concerned, it depends on what your specialty is and your level of function post op. Don't hesitate to request retraining in a different speicalty if that will salvage a career. Best wishes.