Is typing aggravating the underlying injury that's never been diagnosed? I'm trying to ask questions so you consider what is best for your health, not just for your job. If your health worsens all your sacrifices will be for naught anyway.

I'm not suggesting you spend your time in bed. Clearly, that isn't what you need. Do you need Physical Therapy 3 times per week with a very talented therapist? Would working 30 hours a week be less stressful on your very fatigued body? Do you need to be doing warm water therapy every day? HBOT, yoga, massage, meditation, radically changing your diet--none of these things will independently put you into remission, but they can cumulatively help. And so on! You might regret not taking advantage of a relatively small window in which your odds are significantly higher to go into remission.

If you're still a valuable employee, the only reason I can imagine them wanting you gone is for fear of starting a WC claim. If they're concerned about liability issues and you further injuring yourself--falling at work for example--they have a valid concern. Maybe your doc prescribing a wheelchair will be enough to take care of their concerns?

It took two surgeries before my original injury was discovered--a small torn tendon. Just because your underlying issue hasn't been found, doesn't mean it won't be. Starting a WC claim doesn't mean it'll be accepted--but it will protect your rights if it can be determined that a work injury is the cause.