So how happy have you been with the bike till now? If you've been comfortable, I'd replace the handlebar with one as nearly the same as I could find.

"Rise" is the elevation difference between where the handlebar clamps into the stem and where your hands go. Try to figure out a way to measure that so you'll know what to look for. That's an important measurement.
"Width" is the distance end-to-end. That's important too. If your new bar is very much different you may find yourself replacing all of your cables. That's a fairly big job.
"Sweep" is the angle of the handgrips relative to the direction of travel. In real life sweep turns out to be a function of how wide the handlebars are - the least of your worries.

Once you know those three dimensions, check Bike Island or Niagara Bicycle to see what they have.

Or you could take the bent handlebar to your local bike shop and let them find one for you.