Everytime we flush the toilet it sounds like a train going thru the house. Can someone walk us thru the solution? It only started about a month ago (we are at our 2nd home, that's why we let it go so long, but now we are here for a week). Once the toilet is flushed it takes about 15 seconds before we hear the noise slowly get louder and louder (sounds like air in the pipes). If we turn on the water in the sink it helps somewhat. The sounds lasts for about 10 seconds and goes away. Can this be done by us or do we need a handy man or plumber? Waiting for you reply. Many thanks and happy holidays.