AKA, a little more information would help us help you. The amounts of K-meta one uses to sanitize equipment and to stabilize wine are markedly different. I use 3 tablespoons in one gallon of water for a sanitizing solution for equipment and I use 1/4 teaspoon in 5-6 gallons of wine for stabilization. What did you do?
Some other questions that would help; Is this from a kit, fresh grapes or a juice bucket? What variety of wine is it? What were the initial and final SGs? When did you start the wine? What have you added to the wine?
If it is something like a overdose of K-meta, a couple of splash rackings would help. Try taking a small quantity of the wine (perhaps half a 750 ml bottle), hold your hand over the top and shake the bottle a few time to expel any gasses. If you get a strong sulfur odor, it is probably too much K-meta. Repeated shakings would simulate splash racking so see if that helps in getting rid of the bitter back taste.
If this is a batch of wine you just completed, it may just be the youth of the wine and that will mellow out with aging.