Lately, I've been feeling "the pain". It starts after 7 hours at the office, and has become a major nuisance.
I'm only 35 and I wouldn't like to be unable to work by the age of 40 or 45, so I'm taking some steps. After a recommendation from JoÃ£o Bordalo at the local Mac-for-geeks list, I've installed AntiRSI, and so far I've been able to cope with the forced intervals, even when they appear in the middle of a wicked Perl line.
It's too soon to know if this will work or not, and a trip to the doctor (aka, my father) will be required, but for now, it seems to be forcing me to rest more.