I lose control over my speech when in heading into a meltdown - I can only manage disjointed words or noises, and I can barely speak at all when in the middle of a meltdown. My motor control is usually okay, though my hands shake when I get overloaded and I can find it difficult to move. (Also I get your thing with needles. I have to have a blood test every year because I'm diabetic, and I hate it. One time four people had to hold me down.)