I have a knot on my head that will not go away. Over the past year, I was in a car wreck that caused a concussion, but seemed to go away just fine. Then last week I got hit in the head and the knots swelled really big. That swelling has went down now, but there is a new knot that is really sore to touch and I don't know how or why it is there. I do not drink or anything like that so I remember what I do. Does this sound familiar to anyone? My eyesight has been deteriorating lately, as well as frequent headaches.