This is painful and my ear is numb,this is located on the left side of my neck at the base of my head.Feels strange unlike a head ache.kind of icy feeling at times like my hair is wet,cold.im feeling nausea too.the pain line runs up from the knot kind of like a ram horn.the pain is centerd on this line. but at times fans out.i am having issues with my balance as well.Now i did sustain a head injury in my youth ...age 9-10 years old while rideing my bike,my mother says i rode my bike home and more but never remembered that occuring.i am scared and just wanting some picture of what is happening.