Links:

This link shows how contrast baths helped a sufferer of RSI:

http://www.ergomatters.co.uk/blog/rsi/rsi-pain-relief-contrast-baths/

This link offers informative and clearly written advice on sciatica and ice or heat treatments:

http://www.spine-health.com/conditions/sciatica/sciatica-first-aid

This links gives well explained examples of stretches for lower back pain using video and photos:

http://www.lower-back-pain-answers.com/lower-back-stretches.html