Jo,
I can’t tell you anything useful, I don’t think. I am here wishing you on, like crazy. I don’t think you’re alone. I know @Teiry has been fighting to regain good movement and I know @Charles3 was very disabled. These are the only guys I can think of for the moment, and I know I’ve mentioned Teiry before.
The one thing I can hang my hat on slightly was the film of Richard Gray, who I’ve probably mentioned before, “My Amazing Brain” and in that I’m sure Richard spent four years to get back to a decent level of capability. So don’t give up yet. It’s as hard as hard gets, I’m sure, but the only way to get better is to keep trying.
Three years isn’t “early” in your recovery but it isn’t the end.
Sending you my very best wishes, as always,
Richard