Okay, im not sure if it IS a hole, but at the top front of my head, i feel a cold, and "empty" sensation on my head. The coldness is why it feels empty. It scares me. Its in the frontal lobe too so I'm afraid some neurological disease is eating away my brain tissue. Im always afraid of brain disorders. its the main reason for anxiety. Thats why i always get terrified when i feel this sensation in my head.