This morning when answering the phone at work the dial tone and the people talking sounded funny. At first I thougt it was the phone, but later when I happened to answer the phone with my left ear, everything sounded normal. I immediately switched to my right ear and noticed that the dial tone was louder and more of a buzz ier sound than the normal steady tone, also the people had a sort of robotic sound. Now there is a slight ringing, or white noise sensation in my right ear. I did have a slight headache for a while, but took tylenol and it went away. Any idea what could cause this so suddenly?