Interesting, thanks. I had a pretty happy childhood in general, but I was a pretty lonely kid for large parts of the time, and I've certainly experienced a feeling of being abandoned or left alone several times since that. And although my memories are fuzzy, it's possible that the current symptoms would have started originally developing after one particularly traumatic relationship/breakup when I was around 19. Also, meaningful social interaction with people seems to be the most reliable way of making these feelings go away for a while. Also, I tend to react really strongly and positively to any fiction that portrays strong, warm relationships between people.

Most intriguing.