Cheerleaders, singers, teachers all can develop nodules simply the overuse, or in a rock singers' case, abuse of the vocal cords
Try some vocal
rest. The very worst thing you can do is talk, and whispering is a no-no. Talking is something we do by "habit" so we usually don't support that sound with adequate breath support. If you find that it is getting worse, you can find an ENT (Ear, nose, throat doc) in your area, and try to find one that specializes in singers.