: This is strange, for two weeks now every time the toilet flushes and fill back up there is a very loud screaching sound like a train whisle. It sounds like it is coming from the ceiling. What is it? Do I need a plumber?

The link below has some good humor on your problem. It sounds like a tank rebuild is in your future. Some homeowners tackle this, some bring in a hired gun "plumber" The fill valve "ballcock" SOUNDS to be the problem.
Terry

• Titanic tuba toilets