I've had it for ten years. Seriously, I might add..
When I used to touch a string, the pain was incredible. The Doctor mentioned cortisone injections or surgery. I freaked, since I was a professional musician. I was even more depressed due to the fact that I came off tour and my wife had bought me my first 6 string and all I could do was put it on and look in the mirror.
People kept mentioning the Alexander technique, but in the end, I just stopped playing for several weeks. Avoided, extreme angles on the right hand and when it hurt, I stopped playing.
Now, I can play for around 4 hours, (letting the amp do the work, i,e, louder amp = softerplaying) without pain. After that, I start feeling some tightness.
R.S.I. is painful, but if you use a little sense, you'll be ok.
just my 2 cents.
I'll say one thing, between the Sciatica from carrying amps, or the R.S.I.
from playing bass. The Sciatica DEFINITELY hurt more! Being unable to play for a few weeks, or being unable to walk... Talk about hazardous to your health!