Personally I think there is a connection, and I'd love to read your work when you've finished!
I've played instruments all my life, I've always been able to naturally play anything I've picked up, even when I was a little kid. I've never had any real training, and I can't really read music. I think it's my ocd that has given me this gift.
It's my ocd that allows me to keep in perfect time with things, it provides a pulse in my head for me (so much that I have to walk in time with other people).
It also allows me to 'focus' (well get completely obsessed really) on one thing, so even though I can't read music I can sit there and pick out each individual note and learn a piece that way.
I get what are called 'musical hallucinations', (well it's similar to those, those...you might find this interesting: http://www.dr-bob.org/babble/20010605/msgs/65468.html
But this allows me to compose with relative ease because I hear new compositions in my head then I just have to work them out (but they do generally come at inappropriate times)
It's also during playing music that I am more or less obsession free. I also suffer from intense violent images, which all but disappear when I play music (even if I do have to start the piece over and over again because of the ocd).
Hope that helps...if you need to ask anything else, feel free to!