I don't think a nerve block would have worked. I was given one years ago and it didn't work for me. I was just diagnosed with a spinal fluid leak after ten years of doctors telling me I was fine and just had migranes. In my experience the pain was constant. Does his grt worse when he bends over, coughs, or laughs? As for running, in my case I was not able to do any physical activity without my headache being sooooo much worse. Go to Mayo Clinic in Minnesotta. They found out what was wrong with me after so long of suffering. I had to get spinal surgery in September of last year to surgically repair the tear.

My brain MRI was also normal. My cervical and thoracic spine MRI is what found my leak. Contrast doesn't matter. Has he had any spine mris?
My headaches also got worse at night.
I had no nausea, no dizziness, no vision problems.