Sorry to hear that mate,
I'm not a doc, but the symptoms you describe, (i.e. numbness, tingling, and burning pain) are all symptoms of a compressed nerve. The affected areas you mentioned (i.e the pinky and (I'm assuming the pinky side half) of the ring finger are supplied by the same nerve (the ulnar nerve).
gee you sound like one mate ..lol...
... lol.. nah, just spend a lot of time talking to them...
yes the numbness is local to the palm and top of the hand directly in relation to the ring and little fingers.......
... so no tingling at the back of the hand past the knuckles? If so, my money would be on compression below the wrist (where the knife handle pushes on the palm when chopping), but you'd need to get it checked out to confirm.
If I'm right (& the compression is just below the bony part of the palm opposite the thumb), I'd try to get a knife with a wider handle (or wrap some foam around the handle of the knife) to distribute the pressure more evenly accross the palm &/or grip the knife so it sits more on the base of the thumb. That may relieve your symptoms, but rest is the best medicine in either case.
The important thing is, given that its caused by chopping, it's unlikely to be anything nasty.
the chopping surface about the only one relative to my height and the only one i can use without having t hunch right over ...but this bench in a right pain in the perverble as its a home made jobbie that keep moving around on you ...but in saying that its something Ive just had to live with over the last 12months.......
errr... 
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