Just a personal observation/opinion, but I wouldn't say having horrible headaches, confusion, memory loss, etc. means nothing is wrong.
Imaging isn't foolproof or conclusive; it's a diagnostic tool used in combination with other kinds of tests. Like other kinds of tests, each has limitations, shortcomings, and is subject to technical and interpretive differences.
What do your doctors say?
Dr. Zachary Smith
Oh, the pain... THE PAIN...
Dr. Smith is NOT a medical doctor. He was a character from LOST IN SPACE.
All opinions expressed are my own. For medical advice/opinion, consult your doctor.