Hi, I am a nurse and at work. It is an active unit. This is the 3 rd time the following has happened. When I sit down, it feels like my neck muscles are slightly cramping which radiates up my neck and up the back of my head which as it hits the back of my neck and continues up it feels like it is burning. That area is from the base of my skull up 6cm. It makes me have to stop what I am doing. There are no other neurological issues, and it lasts aprrox 3-5 min. The only other issue is I have nausea. What could this be?