Hi! Hopefully you'll find this forum a great source of advice - I certainly have especially as much less info around in UK.

I also work in NHS, although I'm currently doing research. What has helped me recently was an occupational health review of workstation - I have a special chair, normal keyboard but a wrist support pad and they looked at exactly the distances my screen etc should be from me. I also needed a foot rest to ensure my spine was at the right angle. A good physio could also do this if they have an interest in ergonomics.
Like you, voice activated software at work wasn't an option but I touch type which I think helps. It's important to take a break even if briefly every 45 minutes or so and to try and keep an eye on your posture while you're sitting. When mine gets bad, I flare up my symptoms.

Hope this helps

Good luck

Jenny