I was laying down, head on a rolled towel , for twenty minutes. I got up and felt like the back of my head was asleep. I felt dizzy and very off balance. Now, two days later, I have a slight, occasional pain on back, right side of head. What could this mean? I am VERY healthy, exercise every day, eat healthy, take NO meds. I am on the Lean side. I do drink wine at dinner, most evenings. I am 64 years old.