Kitchen sink overflowing from upstairs water
I live in a two story house and my downstairs kitchen sink is overflowing every time we use the upstairs toliets, shower or washing machine. It does not overflow if we use the downstairs bathroom or dishwasher. We called a plumber to get an estimate and they said something is clogged in the drain and will cost $375 to fix. I do not have any money to pay that cost. Is there something I can do myself to unclogg it? I can not imagine it being anything other than possibly a tampon.