The Best Advice for a Writer...

...isn't how to get published, or how to find an agent.  It's simpler and more mechanical than that.  Make sure that your workspace is arranged as ergonomically as possible.  If you become as obsessed with writing as I have done, you will sit for hour after hour in one place, possibly in one position, typing as if your life depended on it -- maybe it does.  If you want to stay the course as a writer and put in the hours that it will take you to improve your craft until your work is publishable, you must do everything you can to protect yourself against the writer's greatest curse - RSI or WRULD (Work-related Upper Limb Disorder)as we must now call it.

I am speaking as one who has just come back from the doctor having had a cortisone injection into my shoulder to keep me going until I have finished editing my novel.

There are a number of things that you can do:

• You can invest in voice dictation software.  Dragon NaturallySpeaking is the market leader and more recent versions than mine have a high level of accuracy.  It doesn't take long to get used to speaking your thoughts out loud and once you get used to it you will find that you can dictate about 75% of your output, which will take the strain of your arms and hands.
• Buy yourself some support bands for your wrists and elbows - most chemists have them and they are great at holding the tendons in place in order to minimise the wear and tear on them.
• Download some software to prompt you to take regular breaks.  I use Workanomics, which doesn't just flash up a reminder, but suggests useful exercises for you to do as well.
• Get yourself a decent chair and make sure you are sitting at the right height in relation to your desk and your computer screen. An ergonomic keyboard can be helpful and I use a Wacom tablet and stylus instead of a mouse to cut down on clicking.

Prevention is obviously better than cure, because once you start showing symptoms it is hard to make them  go away.  Hopefully some of the ideas above will help you to manage your condition, so that you can keep on doing what you love best of all -- writing.