What Can Cause Rumbling In My Ear?

Yesterday early morning I got this rumbling in my left ear when ever I yawn, or touch it, or even get close to touching it (which is weird). I woke up this morning and after an hour or so it started back up again, just as it did yesterday. What is this? I hope it will eventually go away. I am going to try and drain my easr out tonight. Any advice to help me out?