Both my kitchen sink and washing machine drain are backing up. Thursday night the kitchen sink started draining slow and it started backing up out the washing machine drain in my laundry room. I used baking soda, vinegar, and boiling water in the sink and it seemed everything was back to normal until I started my Saturday morning laundry and the drain water first starting backing up into my kitchen sink then back out the washers drain pipe.

I'm not positive where to begin, but due to finances I really have to fix this myself otherwise I won't be able to afford to call in a plumber till after New Years.

I'm planning at this point to the sewer clean out even though its currently raining cats and dogs and to go to Home depot and buy a snake.

All a help/suggestions will be greatly appreciated.