You may recall that humoural theory is based on the ancient and medieval physiology and medicine as expounded by Empedocles, Hippocrates, and Galen – it’s all to do with the four blocks or ‘roots’ of the material world that manifest in certain humours and their related temperaments:
Often we experience various combinations of the four humours resulting in mixed temperaments – the more balanced between the four humours, the better – but this one won’t be be easy to balance; the shared quality between the Sun and the Moon at the moment is cold and that suggests a combination of low energy and a rather sober mood.
By nature, the Phlegmatic is shamefaced and sober and the Melancholic, suspicious and musing. Put the two together and there isn’t much you can do to balance out what is likely to feel like a cold shower.
In terms of the Jungian Functions, feeling is infused with sensation – hence your perception of what’s going on around you is likely to be as overwhelmingly gloomy as it is accurate. But brooding over the current state of affairs won’t change them. Hence the best way to deal with this Phlegmatic/Melancholic energy is to sit tight and avoid taking unnecessary action for it won’t be too long before the Moon shifts into Aquarius and then you’ll be able to gain some much-needed distance and perspective.