I'm still learning about my system, so have no idea who the host is, or anything like that. I just had a somewhat similar experience this week. I have lately been hearing a small child screaming in my head, over and over "you are a bad _____" with so much rage, I knew it wasn't my youngest known alter. I was really being affected by it one night, and all the younger parts were upset and freaking out. I wrote a poem to the 'voice', because I'd begun writing poems to the known youngest alters and they responded well. I'll copy/paste it below. Because my 9 year old alter responded well to being complimented/accepted for having such an angry spirit, as she sees herself as strong, important, etc, I thought perhaps this technique would work as well. I'm still not sure who does the writing for me, if it is someone new or someone I don't know has that abilitity. It just comes and I write it out. I asked her to try and talk to me, if she felt she could. The next day I was having a hard time, and I could feel her emotions, wants, etc. I've realized she's younger than the others, no more than 2, as he main desire was to go back to the safety of her crib. So perhaps writing, singing, drawing or something like that to communicate with her may help? Only you can know. Here's the poem:
I look inside, my eyes closed tight.
I know you’re there, somewhere.
I hear your screams so full of fright
But why, I’m not aware.

So helpless, angry, small,
You stick up for yourself.
You seem to give your all,
Courageous little elf.

My heart breaks as I hear you;
I cannot help but cry.
I wish that I could help you,
But don’t know how or why.

Why the need for yelling?
To shout out “you are bad”?
Without your help in telling
It makes me feel so sad.

You’re little, I can tell,
Perhaps my Maya’s age.
But Maya doesn’t scream or yell,
She doesn’t have your rage.

So who are you my little dear?
Please help me understand.
I wish that I could hug you near
And hold onto your hand.

The world can be so scary.
You’re tough, I see that much.
I hope you’re not too wary
To feel my healing touch.

What wound must you carry,
To have to be so strong?
Your load I’ll help unbury.
You’ve had it much too long.

Please trust me, my courageous elf
And help me get to you.
No matter if you hate yourself,
I love you through and through.

You needed at the time to be
An angry, bitter soul,
To get through times that seem to me
As burning hot as coal.

But now believe me when I say
You’re not alone, my dear.
Trust me and I’ll find a way
To take away the fear.

If you’re afraid to tell me
Why you feel so very mad,
Take your time and get to know me
‘Til you don’t feel quite so sad.

Thanks for being angry,
It’s hard for me to feel.
I’m proud of you, believe me.
I hope together we can heal.

So if you’re mad and all alone
Please talk to me my dear.
Just like we’re talking on the phone
I’m always very near.