For over a year I've had a skin itch which is all over my body in random places at random times, but worse at night when I go to bed. There is absolutely no signs of any rash and my skin isn't dry. I've had blood tests which have proved negative, and scabies has been treated as an experiment, but again treatment failed and I never believed I had scabies. It does feel more like a tingling sensation whereby insects are crawling on my skin, but again no physical signs. Could it be something to do with my nervous system? Please help as it's causing me a lot of grief and lack of sleep!