See this for what to do when your BlackBerry gets wet.
Got Your BlackBerry Wet? - BlackBerryFAQ
The most important thing is to leave the battery out until the device is completely dried out. If you put the battery in too soon, it can ruin the device. Hopefully with some luck, you can get yours back to normal. There are other threads here where BlackBerrys went for a swim and survived after proper drying out treatment. Good luck.