On the top of my skull there is a knot. It doesn t hurt but, on both side (left and right) of the knot it feels as if there was a cut made on both sides. I ve never had brain surgery or scalp surgery. I was pressing on the knot and suddenly after a few minutes I started feeling very sick to my stomache. I have not idea what s going on. I haven t dropped anything on the top of my head to get this knot either. What do you think it is?