My advice here is that there’s no need for your host to reach out to anyone yet.
The best thing at the moment is for the two of you to communicate and begin to understand and share with one another.
I think the first step is for you to share this message you sent us with your host, and ask them to respond to it, and find out how they feel about your feelings and desire to help them. The two of you can start a dialogue.
It sounds like you’ve already read a lot of the available material for dissociative Identity disorder, so I’m going to tell you something that doesn’t come up in a lot of that material.
There are other origins for and experiences of being a plural system outside of what’s characterized in the diagnostic criteria of DID.
I’ll give you some material to get started, but what you should do is look into what’s called endogenic plurality or other plurality origin types.
None of these are fantastic or complete sources but they will get you started.