Mine in most noticeable in my left ear, though sometimes I feel it's coming from the left side of my head too. Perhaps yours is coming from both your ears at equal levels and therefore sounds like it's solely your head?
I suggest that because a little over a month ago my right ear spiked and noise started to become really noticeable in that ear, since it's usually only my left. This happens sometimes but usually after 5-10 seconds it returns back to normal where I can't hear anything at all in that ear. However, this time the noise lasted for a couple of days. I noticed the first time I woke up to the noise knowing it was coming from both ears, it felt it was entirely my head