If you're using mostly a laptop keyboard now, you have far to go in search of better. Maybe merely a full-sized keyboard will help. I am really liking my Aluminum Mac keyboads (which are sort-of like laptop in terms of key travel and height, but spread out more.) There are an awful lot of designs claimed to be ergonomic, all different, and I doubt that there is much far reach actual research that shows how good or bad they are. And snake oil. I haven't seen any paths that lead a would-be keyboard selector down a path to the board that will fit him, personally, the best, which worries me...
Your Dr may or may not have better clues as to which types of keyboards go with which types of pain, and etc.
I would suggest trying some of the cheaper varieties of full-size ergonomic keyboards of various types. Once you've found a type that seems better, then you can go off for the high-priced keyboards of similar versions...