I ment depressant in a more generalized context. The 'happy phase' is self evident, some people feel angry after this and can get out of control due to lack of inhibitions and the emotion combined.
Everyone's different though for sure. If you have a really good night, or good time; this prevails into the next day.
I read over and over way's to overcome comedowns. Myself I don't really get comedowns as such, just really tired. Booze however on occasion makes me wanna just curl up in a corner.
They have a certain vitamin patch in the States that's been banned in the UK to forgo the hangover. The best we have here to my knowledge (which of course is subjective) is Dioralyte electrolyte powder.