The humming can change in intensity but it’s always there. This is in addition to my constant chiari pain which usually feels like being hit in back of head with a baseball bat. But can also feel like a spear or a boulder going through my head. Also having balance, coordination, inability,to concentrate, nausea, dizziness, vertigo, reading makes me sick. Any movement can exacerbate symptoms and it’s difficult to make it through every day. Also , sometimes lose vision in one,or both eyes. These symptoms started out of the blue about nine years ago when I woke up with severe vertigo. I am sure I need surgery but doctors in my city don’t understand. I wish I knew where to go for expert help but,it’s difficult to search in this condition.