Be careful, is about the best advice I can think of.

Try reading up on Carpel Tunnel Syndrome:

http://en.wikipedia.org/wiki/Carpal_tunnel_syndrome

...and see if your symptoms are similar to this. If so, it's time to make a Dr. Appoint before it gets any worse.

If it's simply a matter of overdoing it or muscle strain, a couple of days rest will probably fix everything.

Just don't overdo it and don't rush yourself. It's sort of like weightlifting.
You need to do repetitions in stages to build up your muscles and finger strength. You can't just go all out and expect to be a Schwarzenegger in the space of a week. :)