This has been a major symptom for me when I am having my hardest times and am feeling vulnerable. Slow, monotone speech; getting choked up so my words won't come out when I'm most emotional or when surrounding noises send me into auditory overload. As far as I can figure out, part of it has to do with the Sensory Processing component of my PTSD. As Barberian said,
When talking to others I often close my eyes to cut down on the sensory input my mind is recieving because it is often getting overloaded
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I do this at these times, or look at a blank wall instead of looking someone in the eyes when listening to them, because trying to process auditory is challenging enough without having visual input as well.
What I find to be even more relevant, though, is that my speech takes on a very specific infantile form when I am feeling vulnerable or overloaded. Very weird. I would love to have name and more understanding of this. It's hard to try to remember how it sounds when I can be eloquent, like now, but I know I don't use articles like "a," "an," or "the." And I don't use the future tense, specifically the word, "will." So instead of saying "I will go for a walk now," it would just come out "I go for walk now."
But, that said, I was in that state for several weeks until last Friday (three days ago). Had a bad bad bad breaking of promises to me which resulted in not feeling safe or valued and feeling judged. Came to the conclusion that it's not safe to trust anyone, not safe to feel any emotions. So much HUGE rage and pain that it was only a choice of freezing all feelings or killing myself to make them stop. Toss up. Could have gone either way. Decided to put all feelings and vulnerability in the deep freeze. The little child that was trying to heal got killed and put in the deep freeze too. Hope I can revive her and help her later in a safer place, but this place is not safe enough for her; she was suffering too much.
So by killing off/freezing feelings and vulnerability and the child part of me, back comes my ability to use words like everybody else. Staff think I'm "stabalizing." The opposite is true, but sure, it looks like I'm more functional.
I'm not how much this is similar to others' challenges with language at times of stress. Would like to think I'm not alone on this....