I moved in with my boyfriend and I noticed that sometimes when you flush the toilet it won't go down. It will fill up with water then slowly go down, then after a few hours if you flush again it will go down... that was months ago now we are having sewage waste come up whenever you flush or use the washer! I've never seen this before! I've tried Draino thinking it was just clogged. But it still doesn't work! Please help me!!