I'm not sure what you mean by "computer elbow", but one thing that was giving me discomfort somewhere in forearms or wrists (don't remember details anymore) was

I'm not sure what you mean by "computer elbow", but one thing that was giving me discomfort somewhere in forearms or wrists (don't remember details anymore) was using mouse. Basically, laying my hand flat on the mouse forced me to either rotate the forearm in some weird manner or spread the elbows unnaturally far from the body. The latter, I think, might be the reason behind your issues. I solved this by switching to a trackball with angled top (Microsoft Trackball Optical 1.0) so that my palm doesn't need to lie horizontally anymore. So called "vertical mice" push this idea even further (never tried one). And as for the keyboard, consider learning to touch type effortlessly. With some hunt-and-peckers I get the feeling that they apply all kinds of weird tensions to their hands, especially under stress, which hardly is good for longterm comfort.