Almost a year ago I noticed water leaking from flexible pipe under toilet tank and pipe coming out from wall that flexible pipe is attached to. Graduallly I felt the wall around bathtub it was wet, gradually water started leaking on the floor and into the other bedroom saturating the carpet and now it is leaking into the hallway from that bedroom which is next to the bedroom. I have been putting towels down to soak up the water, and a bowl under the toilet tank to catch that water. The carpet is saturated in the bedroom next to the bathroom and now the hallway carpet is graduall becoming saturated. I sense it is a very expensive job. Please help me!

I sense it is a very expensive job
You have a very good sense. Repairing the water damage will be expensive and will be more expensive the longer you delay.

Repairing and stopping the leak is a very simple task. Dry everything under the toilet tank and tell us where the leak is occurring. Is it coming from around the handle stem of the stop valve, is it coming from the connection of the flexible tube to the stop valve, is it coming from the connection of the flexible tube to the fill valve, is it coming from around the nut that holds the fill valve in the tank?