Hello Fadedone, I wish you every success though, you might have some battle ahead, proving it, they will try and wriggle out every time. In my case I am trying to prove that my currrent sciatica which started after a fall at work, is NOT related to a previous back problem that was resolved over 7 years ago, so the other way around to you and I am SO frustrated now 2 1/2 years later . . . . I would just do as much internet research as you can and hope that people on here can advise you.
Take care and the best of luck.