In reply to PeteDP:
Broke 5 or 6 vertebrae, the whole right side of my ribcage (punctured lung and internal bleeding), right clavicle, and got a nice concussion four and a bit years ago after a 10-15ish metre groundfall slipping off a wet grass mantle on terrain which I was largely comfortable with.
I'm still young (early 20s) so this may vary for you. Within 6 weeks I started doing yoga (still in my spinal brace) and within 6 months I was training harder than I ever had before. 9 months post-accident I sent my hardest boulder grade at the time. I think I found motivation following my accident to become stronger and more competent which helped me deal with the immediate mental aspect of it. My back still sometimes feels 'funny', especially when sitting with poor posture, but it doesn't affect my day-to-day whatsoever. As others have said, focusing on core strength is important and also ensuring that you train the posterior chain.
I still find onsighting and dealing with uncertainty to be a hard mental challenge (although I am actively working on this), but I took the approach of trying to get back out on rock as fast as I could. For me, this was just working on local boulders that I was familiar with and comfortable climbing before progressing to roped climbing. I do think getting back on the sharp end is something that is important to do rather early, when you feel comfortable to do so. A nice way to do this as well is to top rope some routes before going on to give them a lead (the grade doesn't matter so much.) I would say that over the past year is when I have started to enjoy climbing on a rope more and have found motivation for harder projects and harder onsights. A high volume of climbing can help you reacclimate to the sport and to deal with challenging aspects.
For me, there was a degree of shame/guilt and self-doubt that followed this. I have since been trying to prepare myself to volunteer for a local MRT once I am in a position to do so, I think being able to pass on help to others is another good way of dealing with it for me personally.
Feel free to drop a message if you want to call/meet-up/climb to discuss more, hopefully your recovery goes well!
Post edited at 18:24