Hi darkpurplesecrets,
I understand what you are saying. Do you have any children yourself or have you been around children? It's very hard for me to nurture myself, but if I think about what I did to nurture my children and other children, it's easier to know what to do for me.
My son just loved to cuddle when he was little. He also loved very soft things to hold onto. My daughter was more apt to color and draw and that was soothing to her. So I try to make available those types of things in case my brain needs something. I'm not always successful in making the crying inside my head lessen or the screaming to stop, but sometimes it helps.
Sometimes the noise gets so loud, I do wonder if it's coming out of my mouth. T said that when it's louder, that's when the barriers are thinner. It could be from being triggered, though probably other things factor in as well.
It's hard for me to accept the fact that I have parts of my brain that appear to be stuck in young ages. And it's hard for me to self sooth in order to comfort them (ah, I almost said shut them up, so I guess that shows how unaccepting I am at times

.)
Anyway, maybe you can try that kind of thing? It's definitely worth a try.