I think the word would be hyperactivity, it does feel like my thoughts for what I'm going to say are slower than the words are coming out of my mouth, and I do get unsolicited negative thoughts, I got told it was thought insertion because, for me, it felt like the thoughts, words, and images were coming from outside my head, and it felt like they weren't coming from me.

I have depression, so I understand why I go through periods of not thinking.

Thanks, its nice to know I'm not alone. It really frustrates me when I get my words mixed up and my sentence comes out all jumbled, I sound like such a retard.