When I took out the walls of the bathroom I am working on, I found a junction box with five wires running to it. Here is a picture.
The power to the junction box is routed from the switch that runs the overhead light. This thing is on the East wall of the house. I removed power to the junction box and now I don't have power to the outlets in the upstairs West Bedroom and and the ceiling lights in the kitchen which is downstairs under the West Bedroom.
I don't see an easy option to fix this except to leave the junction box there and run power back to it but that seems like a bad idea to me.
I've been trying to come up with a way to run power to that circuit to another point in the circuit but that would leave one or two dead end hot wires still in the wall of the bathroom.
I think the wire that feeds the rest of the circuit runs under the bathroom floor. Since I need to remove part of the floor, maybe I will find a solution if I can follow that wire for a ways. If I have to install another junction box, hopefully I can get it away from bath tub and other water sources.
I would love to replace all that old wire but it looks like there will still be a bit of it left until the next remodel.