Yes, the "pink cloud" is elusive, and not everyone feels it. And as you are finding, even one individual can experience different things with subsequent cycles of drinking and quitting. I never felt the pink cloud myself any time, but most of the times I quit nothing really bad happened either, I just felt kind of crummy for a few days. But then all of a sudden I started going through fairly serious WD's and even ended up in the ER once with heart palpitations and dangerously high BP/heart rate.
The moral of the story I think is that each progressive return to drinking usually makes things worse when you quit. So staying quit is even more important now. Sound like you are doing a lot of the right things...consider that you may just be down in the dumps...life is not always rainbows and butterflies unfortunately. Another consideration is that perhaps you are actually experiencing depression - which is a diagnosable, treatable condition.