Loneliness and the body

So I have gotten into an obsession to find out about the loneliness and what makes us feel that way…seriously, I don’t think I will be able to let this go until I get my answers…I started asking people that surround me, what they feel when they feel lonely…most of them gave me a very physical description: tired, paranoid, shaky, nauseous…
When I feel lonely, I feel sleepy…like my body wants to bring me to a lovely dream, it wants to forget the feeling…my body is afraid to confront it…maybe, because it would have to confront so many questions as well- Do we all have our second half? Are we all meant to be loved? Will we ever be able to communicate well how we feel to the others? Does anybody genuinely understand us? Are we alone in this Universe? And- in much greater scheme of things- DO WE REALLY EXIST anywhere else but our heads?