Hello! I can’t get my horn to work at all. I replaced the fuse and got no results. No noise or anything when pressing the horn. Any ideas?

Hi. Recently noticed horn had stopped working but when I pressed it the lights flash too. Also one head light is out. Bulb is ok as it flickers when turning lights on. I'm assuming the problems are connected. Anyone had a similar problem and any ideas of what to do to sort it out. Thanks