Interesting post and thanks for all the information. From your history and what I believe was a lack of pre-injury symptoms I would never have thought this was a carpal tunnel issue. For my mind it sounds a lot more like a broken carpal bone such as the scaphoid. This is common in falls onto the palm and is notorious for non-union, often only repaired via a small surgery, a screw and a bone graft from the pelvis.

Right now I would want a scan of the wrist with an Wikipedia reference-linkMRI to exclude any bone fracture and non union. It is quite serious to get it sorted if that is the issue as the bones can degenerate if a repair is not attended to. So get to the GP, get to a hand surgeon and get a new MRI. Then please tell us what is the result. Of couse seeing a physio will help to assess whether this is a possibility if you can access that more speedily as a first point of contact.