Re: I know that feeling well...
I have bolted 8" extensions on the legs of my current desk. My keyboard is about an inch above my elbows and any sort of carpal tunnel pain has gone.
And this is exactly why I nowdays build my home office desks out of kitchen units. They are built to work while standing which makes them by default 5-7cms taller than a normal desk sans legs, add legs to taste for optimal height.