Originally Posted by
crazymanwithaplunger
The hand thing will be a technique issue or perhaps a conditioning issue - but probably the first. I don't know how long you've been playing for, if you get lessons or what, but almost any problem like this is purely because of the way you hold the sticks and/or play. This is of course ruling out RSI or something like that. Without watching you play it would be hard to say how to change your style though so a teacher would be a better bet here - or post a vid or something with a closeup on your playing then maybe we could advise better
As for lower back pain - most likely because you slouch - at the same time a higher quality throne may be of benefit - one that actually supports you. You can even get ergonomic thrones designed with this purpose in mind to get good posture while still enabling you to play properly.
Thats all i got for now