Try turning off the gas and pour a few beers until nothing comes out. Let it sit a few hours and repeat. A few turns and the gas should have lost a lot of its punch with most of the co2 coming out of suspension. Once you have poured 4 or 5 beers, and it is coming out slow to nothing, turn your co2 to your serving pressure and let it sit over night (you just drank like 4 pints, it should be time for bed anyway).
In theory you could drop your co2 too far, but Ive never had that problem, with the beer cold in the fridge it takes a while for all of the gas to come out of suspension. If your setup won't allow any beer to flow without some sort of pressure going in, set it as low as possible, like 1 or 2, just to remove the vacuum lock.