If any one has any advice on possible solutions or ways to ease this it'd be appreciated. 

Recently me and my fiancé have been struggling with being upset. I have BPD and she has autism. She can't cope with the way my mood changes or when I get stuck in emotions, and takes the responsibility on her self. This makes her feel guilty for not being able to help, and it turn makes me feel guilty for being like this. Like a horrible, spiralling, circle of guilt. 

On top of this when we try to talk it out my brain goes into a sort of protection mode and I freeze up, going silent. It's like I'm screaming what I want to say in my head, but my body just won't let me. And it feels horrible. 

I'm sick of making her feel like this but I can't seem to stop myself getting stuck in emotions, and in turn making her feel guilty.