10/2010 I had surgery to remove a brain tumor, I have now begun to hear strange noises in my ear when sleeping?

This noise is sometimes a purring or a gurgling sound, I can't really explain it but, it is driving me crazy! It only happens when I try to sleep and will wake me up in the middle of the night( no issues with day time sleeping). I noticed that it is only in my left ear and when I lay on that side and it not as prevalent as when I sleep on my right. This is something that has just started as of a couple of days ago. I tried an ear plug last night to no avail. I'm wondering if this is something to do with my surgery or not. I did have an MRI in Mar and the image was clear of the tumor. My other issue, is that I'm out of town and can't see my neurologist or neurosurgeon about this issue. How can my brain continue to hear from my surgery without any sleep?