I was removing my wheel today after a 50 ft drive (max). I noticed my lug nuts turned hard all the way out.

When putting it back on one of the nuts went on really hard, so, I tried removing it and while i was removing it, the stud snapped! All of the other three went on okay.

I'm hoping all I need is a new rotor. Please say all I need is a new rotor. I'm sick of fucking with this car. What if this was a flat tire.. I'd be fucked...

How much to repair? What would I need?

I'm already taking it in for a brake bleeding and a O2 Sensor replacement on Monday. Is it okay to drive 'till then?