Hello, have an older home here. Went to remodeling the bathroom and needed to install new light fixture. Marked up my proposed hole to drill, checked for studs and such, and went at it. Cheap stud finder I guess because I tapped an electrical wire, what I believe to be my lighting. Needless to say, my light switch does not work, but my bath fan switch does. Electrical outlet on same outlet switch does not work either. Kinda strange, but what have I got myself into? How much will it cost to have fixed, or can I do something myself? Thanks for all help that comes this way!

damage