Does anyone have any experience with or information on this phenomena?

I am mostly looking for personal experience but solid literature would be great also.

I am mostly interested in things such as:

When did you notice these parts of yourself in Th?
How does or doesn't your T work with them?
Do they scare the begeezers out of you ever?
Have you gotten used to it?
Are there more 'states' than who present at first?

Just starting to get to know my inner selves... I could use support and/or info.....

Thanks ya'all!!