THUMPING IN MY EAR

Ok - this is really weird... I'm sitting on my couch in my office right now doing some writing for a message and I notice that as I'm typing on my laptop there is a thumping type sound in my right eardrum. When I stop typing the thumping noise stops. Plus, I type really fast so it's like a constant thumping. It's driving me nuts and I think I'm going to go crazy. It's like Chinese torture. It almost sound like something moving around in my ear. Somehow the movement of my fingers is reverberating in my ear canal or something. I've never noticed this before - probably because I usually have music on or something.

Any ear doctors out there who can offer a good explanation or theory?