I had a shunt inserted for hydrocephalus about 5 years ago for long-standing hydrocephalus (originally misdiagnosed as normal-pressure hydrocephalus). Ever since the shunt surgery I have had a tight, pinching feeling in my head around the area of the shunt, which I now accept as normal. Last night I got huge shock-like sensations in my head as soon as I lay down. Can anyone tell me if this something that I should be concerned about please? It was really scary when it happened!