Yeah Chez3, its highly unlikely that your teachers would have noticed you dissociating during classroom discussions and documented it. Unless you had really extreme behavior teachers wouldn't notice a thing. Even drs documenting dissociation is an extreme longshot. DID is largely a hidden thing, most systems jobs are to cover up the abuse and keep it from being known about, otherwise everything would have been picked up a lot earlier, wouldn't it? So it's not very likely anyone would have known enough about your behavior to think, Oh, I think this is dissociation and this must be a sexual alter. So I doubt you'd find any useful information at all going down that route.
You might have more luck talking to your T about it or even asking other insiders if they know anything about this one you are beginning to become aware of.