I think that the song may be about someone that may have been lost by the singer. The person that has left may have been in a position that affected the singer's life. The singer wants to be let back into the subject of the song's life, and is infuriated that they have not yet been let in. They wonder what would happen if they contacted the person being sung about again, and can't decide whether they should or not. They want to explain things, and don't want an anonymous person merely known as "the doctor" to interfere. They pretend to enjoy being alone, and am trying to persuade the subject of the song that they do. They also wonder if the person being sung about wants to escape the life that they live and disappear, whether that be death, running away, or leaving a partner.