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What ended up working for you? Type of keyboard, mouse etc.? I got a roller mouse which helps me with mousing, but when it comes to typing I still have to be careful and limit my time at the keyboard. I haven't come up with anything else and the ergo expert (at work) basically just suggested the speech recognition software as a solution. But I'm with you in that I find it stops my flow of ideas so I have mixed results with it.

Since I spend most of my hours at the computer, I had to invest in this.
I got a new desk (just a big surface and adjustable legs; IKEA works fine) and a fancy chair (with armrests, although the chair wore out and the replacement's armrests do not adjust as perfectly - which means I don't use them during periods of activity and that, in fact, helps).
I've found that I needed to set my seat low, and my desk surface a lot lower than recommended. It's so low now that I can't comfortably cross my legs underneath but that seems a worthwhile trade. (Still plently of legroom overall, just not, uh, stackable.)
Basically I am ensuring that my primary arm never really bends at an angle of less than 90 degrees; usually I keep it significantly more stretched than that. For mouse work that actually means my mouse moved way towards the back of the desk (towards the edge of the screen) and to the side, which means that my arm is almost straight for that (diagonally to the side, though).
For typing I push my keyboard around a lot. Half the time it also sits at a bit of a distance from me (although not as far as the mouse).
I also sit very close to the desk. It pretty much touches my stomach (or above the navel, rather).
All of this ensures that the desk's edge never digs into my arm at any point and my wrists are usually mostly straight.
Hm, okay. As I am typing this, my hands do hover over the keyboard and the underside of my right arm does slide across the edge, but it's not at much of an angle, no pressure. My keyboard is in mid-position, too.
For some serious typing I often pull it down towards me, in which case the hovering is lower and the balls of my hands just lightly touch the desk's surface. There's definitely no pressure and think that's one of the key points for me.
I prefer a flat keyboard these days (though they're not as flat as some I've seen), and angle it up slightly. Pretty standard, nothing special. But definitely no handrest attached. That never, ever worked for me.
Admittedly, I am noticing now that my hands hover diagonally (90 degrees to each other) with my elbows out, rather than going for the parallel posture I have seen in pictures. I guess this is simply how I type, how my fingers are used to being positioned above the keys, so it won't work for someone who uses one of the established typing systems. Maybe one of those ergonomic keyboards might do the trick in that case? Angled or curved.
My mouse is a Logitech G500. I love the shape; it fits me just right. Mouse shape is a highly personal thing, though. I use it without any of the weights, and without mousepad. (I.e. it slides easily on the desk, but won't launch across the room when I tap it.)
Most importantly, regardless of which mouse I use, I always set the sensitivity high (or the speed to fast, whatever it's called) so that I do not actually have to move the mouse all that far. Just tested this out for you. I'm moving the mouse only about half an inch across the desk to travel from one side of my screen to the other (all 1920 pixels / 20 inches of it). For most mouse actions my arm rests on the desk without moving at all, the wrist only rotates slightly for maximum distance and my fingers do most of the work. Speaking of which, I have a two-fingertip (thumb and fourth) "grip" on the mouse, although there is no gripping involved, just gentle guiding. That means the lower part of my hand is not actually resting on the mouse itself. This is one of those things that divides mouse users into groups, so it might not work for you. Although the second you rest your palm on the mouse you have to move the entire hand for every little cursor twitch. That's tiring out my entire arm all the way up to the shoulder when I test it.
Oh right. Mousewheel for scrolling. It's a gift. You only move one finger. <3
I find that these days I can type or do mouse-heavy work for hours on end without physical strain or cramping up. (To throw a number out there, like... eight hours of writing in a row, although by then my brain is ready to implode.) It's really quite amazing. :3
I know this is a lot of babble and most likely will be redundant and not particularly useful to you, but maybe there's an idea in there anyway.
In the long run what helped was to restructure my computer desk so that my right hand was positioned in a way that avoided strain and pressure. My setup is not even what most generally available advice on the subject would recommend, but it does work for me.
Voice recognition is a great tool but it makes for an entirely different writing mindset. (At least it does for me; I've tried. Just does not work. I need the quiet space in my head for the words to come and sound disrupts that.)
I do admire that you can do this!
Either way, I really hope you find ways to work around the problem. For the obvious reasons (no pain for you!), but also because I am greedy and love your writing. <3