One of the great lessons this board gave me is the cruelty of shunning by the Jehovah's Witnesses. It is inhuman. The toll it takes on a person cannot be underestimated. Hence, the good advice many give here to build some outside relationships before exiting the society. I'd like your comment on a favorite author of mine, if it resonates with your experience.
Loneliness seems to be an essentially human experience. It is not just about being alone. Loneliness is not the same thing as solitude. We can be alone yet happy, because we know that we are part of a family, a community, even the universe itself. Loneliness is a feeling of not being part of anything, of being cut off. It is a feeling of being unworthy, of not being able to cope in the face of a universe that seem to work against us. Loneliness is a feeling of being guilty. Of what? Of existing? Of being judged? By whom? We do not know. Loneliness is a taste of death. - Jean Vanier (Becoming Human, p. 33)