I don't really have any advice, but I can completely relate to that hum. The sometimes the hum expands and includes a hum in my body - it's just like a tension..but not really. Hard to explain, as if the thoughts manifested physically and became little beads and i can feel them rushing through my body. That's what usually leads to some tiny snaps. But I never voice mine out loud. I just internally snap and have a 10 second "AHH".