I'm dealing with it right now. My weight hasn't budged in weeks and I refuse to believe that the same 1500 calories a day that were letting me drop an average of a pound a week are now too much to let me lose another ounce at this weight.
I'm dealing with it by asking myself some searching questions about what I'm willing to do to lose weight, whether I'm really and truly sticking with my plan, and continuing to count/weigh as if it were still working. If you were to ask me how that's working out for me, I'd give you an answer of "okay" about 70% of the time and just give an incoherent howl of rage and frustration the other 30%.
But I'm not stopping what I'm doing. Not for anything. I may step it up, but I'm not stopping.