this first stanza introduces the singer and how he feels. He feels as if his head filled with hot air, Meaning that there isn't much in it but thoughts about himself and he doesn't know why. All of the things he thinks are rushing and flying through his head about himself, making him wonder what happened to when he would care about others.
The singer wants to refuse to admit that he thinks about himself and is so introspective that all he thinks about is himself, causing a "mess inside" his head, most likely meaning a feeling of hatred or resentment towards himself and his mind.
In the end of the day, the singer still pretends to care for others, but is merely hearing and not listening to what others are saying to him. He then tries to push people away in an act of self sabotage by making them feel bad, tired, angry, or condescended to for just listening to him.
The singer is admitting that through all of his thinking of himself makes him think he is unintelligent because can't understand other people or ideas that aren't himself. The idea of them is just too big for his mind to comprhend, not realizing that it is almost impossible for anyone to comprehend the detail and 3 dimensions of all the lives around them.
The chorus is a wordless chorus, but the singer is still interacting with the song. He is screaming and wailing. Almost as if he is releasing the feelings he has experienced for a while. The screams falter in the end as the song starts to ground back into the lyrics.
The singer notices that every face he sees when he leaves his home don't seem to care about him or anything either, or at least they pretend not to. This lack of empathy also makes them unpleasant and scary to be around. He starts to panic. Heavy breathing, desperation for someone to come and help him, and yet in a moment he feels so exposed one of his most vulnerable moments, he is only stared down upon and not helped.
The singer knows he has a false perception of himself and others that creates a downfall of feeling that what he says and his choices don't matter to the point of possibly hurting others in the process and making them feel insecure by projecting how he feels on himself upon others like a weapon or defense mechanism. as an escape from himself in others, the singer feels solice in the dreams he has, but eventually end when he awakes to his great dismay.
The comfort he finds in dreaming causes the singer to experience a disconnect from real life. Being away from the escapism that is dreaming makes him anxious and feeling like he is recieving punishment for the things he does while sleeping, speaking of him having to wake up from his only source of happiness into percieves as a cruel and hopeless world, and himself as a cruel and hopeless person. During this time he tries to feel better by remembering and thinking about his dreams, but once he inevitably starts to forget them, he becomes desperate and scared, like he is forgetting a good friend.
The singer's dreams (most likely lucid dreams) are amazing and incomparable to his real, unhappy life, and when he forgets his dreams or they end, it feels like he is losing a lover. This could be read as if he created a lover in his dream and everytime he wakes up he feels like his lover dies due to not being able to create a carbon copy image of his lover the next time, or he is so obsessed and addicted to the happiness and euphoric joy his dreams make him feel, it seems as though that happiness dies everytime he awakes.
the screaming and wailing continues, but it has grown desperate and almost stricken with tears, sounding almost as if a plea for help, but no one returns any words.
When he is dreaming, the world feels real, but the singer is finally in control of literally everything that happens. His lucid dream reality has no ends to as opposed to real life where he is greatly limited. Things that he could never amount to or do, he can finally achieve while sleeping. The capacity of his thoughts that he used to hate, are endless and useful in his dreams, but the real life forces him to deal with his real self and his humanity, which he despises.
The singers "elaborately designed, privately owned spiral galaxy" in his dream has clearly grown into a greater reality than his own, that is comepletely his. We are also given detail to the true effect of his escapism. He is financially failing and soon won't have a home to sleep in if his landlord doesn't give him another chance, which he will inevitably ruin too. If he has no safe place to sleep, he won't be able to escape into his dreams. His lucid dreaming has broughten his life down to almost unfixable shambles and the effects of his sleeping and financial instability has made him most likely unkempt, malnourish, weak, and generally unhealthy. He tries to fix his issues, but he craves and can only think about going back to his dreams, now like a hopeless addict, but he still wants an epiphany, a reason for him to stop dreaming with such reliance. When he sleeps he understands everything, a feeling that nothing in real life can amount to.
The final round of screaming and wailing is dejected, like it is only trying to complete the pattern in the song. The singer is done and has lost hope for himself.