Thanks for your replies!
I had another trip yesterday, this time I took a little bit more (30 mg), although I took it in in two times separated by a couple of minutes. I used my phone as a voice recorder.. but I was too amazed to say anything

. However it still helped me understand a couple of things.
I took about 3 hits, and the - now familiar - 'DMT buzzing' began. It grew much more intense this time and bifurcated into several different hums, buzzes and chirps. I've never experienced aural 'hallucinations' on any other psychedelic. The sound preoccupied me and I wasn't able to pay attention to anything else. Even though the sound itself was unpleasant, I found it interesting more than overwhelming or scaring. After what seemed like an eternity I turned on some music to see if it would make the sound go away. Immediately the whole experience changed. The buzz was gone and replaced by a beautiful soundscape (Carbon Based Lifeforms) and I was able to focus on other things. Later, when listening to the voice recorder, it turned out a car alarm went off just after I took the hits

, what aural terror.. I tried to walk around my room, but staying balanced turned out to be quite hard as the floor seemed to spiral in and out of existence. I sat down again and looked at my plants. Instead of the angry faces I saw last time I saw an insect-like form staring at me. The effects seemed to slowly fade and I decided to see if there was any DMT left in my pipe (this turned out to be only 6 minutes after the first inhalation as the sound of my lighter told me). I took a big hit and yes, there was definitely still some left.. What followed I find extremely hard to describe/remember. I focused more on my thinking than on what I saw, and although I remember having some incredible thoughts I barely recall them.. While the effects slowly faded I was left with a very strong euphoria but also some sort of melancholia as the memories of the experience seemed to fade while I was thinking about them.
All in all this experience was much more meaningful/easier to remember. Although I still have trouble recalling my thoughts, at least I still remember most of the visuals which aid me. Perhaps I shouldn't try to care as much about remembering everything and rather just be 'in the moment'. It's similarity to dreaming again seems amplified: I have the same 'forgetting things while thinking about them' when I wake up sometimes.