Taking the mental health topic lightly, Unwell talks about a person who has to fight his inner demons every day while telling himself that he’s not a lost cause, but just unwell. But later on the song, the persona mentioned that “they’re” taking him away, signifying the fear that he possesses.
The message of the song is really just to take it easy on yourself. Things might often go sideways, but always be persistent on waking up and battling the inner demons; an unwell individual could eventually become fine.