I experience something like what your describing, my mind is constantly processing many trains of thought. I actually see five lines of thought constantly flowing and moving off. Each line has to do with a different subject and it never stops. I compare it to what I call the New York Stock Exchange Leader Board when describing it to someone. Sometimes when I'm in a conversation with someone I have to really concentrate so that if they ask me a question I don't answer from the wrong line in my mind. This has been the norm for me since I was a little girl. It's always on even when I feel or felt perfectly fine. I also suffer from chronic insomnia and when I haven't slept for at least 4 days I experience auditory hallucinations. This is when I hear music and it is the same song or group of songs over and over, this does get on my nerves quite a bit but it does go away as soon as I finally get some sleep and that is usually around the 4th or 5th day without sleep. There have only been two times I reached 8 days without sleep and that's when the real "fun" begins...visual hallucinations. As for the constant train of thoughts, I've just learned to live with it, doesn't really bother me but the repetitive music thing, that's a bit unnerving. I wish I had a solution or could suggest a medication but nothing unfortunately has worked for me. I'm very drug tolerant.

I wish you luck and hope you can find something to help you with this!