I used to have the pink fog that would appear and disappear for random periods of time, and would get unbearably strong at times. As of the past year or two, i would say that the fog may ebb and flow, never truly disappears anymore. Also, when it is at its strongest, it's not quite as much of a pendulum swing as it used to be.
Since my wife started accepting Lisa, I have been wearing panties full time, wear a nighttime to bed every night, use nothing but feminine fragranced soaps, lotions, and perfumes, keep my nails painted 100% of the time, and am able to wear a dress in my office when it is just she and I at home. I think that this has balanced the pendulum swings of the fog, for me anyways. Even whe I'm not really "feeling it", there is always something feminine I have going on. The periods of not feeling it rarely last more than a day or two, and usually happen when I don't feel well or am feeling a bit down on myself.