Home Treatment for Repetitive Stress Injury

On Monday I wrote about headaches caused by eyestrain, but clearly there are many other kinds of headaches.
Most common are tension headaches, caused by tense shoulders and neck muscles.  Tension headaches manifest with these symptoms, according to Safe Computing Tips:

Pain at the base of the skull
Aches behind the eye sockets
Sore shoulder muscles or neck muscles

Stress [...]

Do you have headaches or neck pain regularly? It may be simpler to cure than you think. Instead of downing ibuprofen or allergy medicines, consider whether you might just be suffering from eyestrain.
You’re a likely candidate if you sit at a computer or read documents for long hours, especially with an old-style CRT [...]