Scared of spiders help?

i am so scared of spiders a few times iv seen one in my house it creeps me out so much that i cat get to sleep if i see one! i hate leaving windows in my house open in case they get in even thought i no they can get in through a tiny hole! i think my son has picket up on my fear of spiders because he is scared now even if he sees an ant he is scared what help is there to get over my fear of spiders because i don't want my son being scared because of me and my fear! x