Maybe the man trying to sell you milk is trying to get you to improve your calcium intake to prevent osteoperosis?
In this case flying milk maybe more of a metaphore for your fill of magick. Flying being the magick and the milk being what you make of your magick - real or unreal. Perhaps you question whether or not magickal endevours are really worth the time? Maybe you feel like you are just someone who just buys into it all and that there is no real substance behind the magick. Of course you do not feel that way all the time either. But sometimes events in life can test faith.
A more subtle interpretation could be that milk represents nurishment and the man in your dream represents your masculine self that is trying to get you to replenish yourself or stay healthy, maybe even live a better quality of life.
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As the dream progressed, I had a vision of a stand of trees whose shadows spelled out "Anarchy".
I'm not sure what you mean by a "stand of trees". The vision I get is something like a woodland area with trees during winter, so no leaves with their branches casting a shadow that spells out 'anarchy'.
Regardless of the season trees usually mean life or ancestory. For the more spiritually inclined, it can also relate to the sephiroth tree of life. Specific trees can also relate to more specific aspects as well. For example oak can represent stuburness, resilience, strength and endurance. Whereas a willow can represent flexibility, over growth, vitality and emotions.
Shadows often represent things hidden from our full conciousness. Its possible that it could even be a prediction of the future or something trying to get you to look at your past. But shadows go hand in hand with things in our selves that the self desires, feels, remembers even senses but just is not very aware of them. If you question these "hidden" aspects more clear answers should eventually surface. And if you pay attention to the type of trees you see in your dreams that might give you more specific leads.