I've been playing drums guitar and bass for over 10 years. I wouldn't say it's bad for you at all but if you are experiencing pain I would maybe take a break for a few days and get on a stretching routine and some light free weights to build up strenght and durability.

It's hard to say what exactly is going on though, it could be a many different things from tight muscles to arthritus(sp)

Lately I have been using this gyro thingy for arm strenghth, it works really well and it's so easy to use anywhere.

yeah, I don't get much pain from drumming but from keys I sometimes do.  I just quit playing for a couple days- no biggie.  I hate doctors so I avoid them at all costs.

"kill" is such an act with such finality.  You might try something more clandestine (and less felonius)...like simple sabotage.

The pain you are describing is something that i find very common in all forms of guitarists/bassists. I'm almost willing to bet that the problem is when you are playing the frets with your left hand, your wrist is bent (___/) < Is what it would look like, the kink being your wrist. It's usually because the instrument is hanging low to look cool or whatever. If you keep your wrist straight, there will be no pain really, and on top of that, you'll play better. It means that you'll have to raise the instrument. It's kind of hard to describe. But basically if you are playing right handed the headstock will be up near your head. It looks as if you are old and such, but it makes for less painful, better playing.

The key ideas are to keep your wrist straight, and bend at your elbow instead, and then lift the  guitar in order to allow this.

I know I did a miserable job at explaining this, so if it's extremely unclear, let me know and i'll explain better, maybe with some pictures.