Hi!
I sometimes have problems with my hands too. Melanie's advice is very good, I would also take frequent breaks and take stretch your fingers out and wiggle them Wallace and Gromit style (cracking toast Gromit) every 15 minutes or so, to loosen your fingers up.[:)]
If you have any kind of pins and needles, or numbness when you bead and it persists after you stop beading for the day, it may be a sign of something more serious like carpal tunnel, or tendon problems and you should speak to your doctor, so he can help you, so you can continue to enjoy your beading and jewellery making.
Love, Jan