I am a SAHM. I have had this problem for more than two years. The scan did not show any anomalies. Sometimes I do not have it for a few months and then suddenly it all starts.
I have recently started updating my CV and looking for jobs. Lots of ideas in my head. Such deep thoughts give me headaches mostly in my left side of the head. When the pain starts it also spreads to my jaw. It is extremely painful and can last a few seconds but then it can happen many time whiting an hour throughout a day. I do not have this when I am calm but only when I am thinking too much about something.
The pain is sharp and knife-like twisting. It reminds me of the afterbirth uterus contractions. The same type of pain spasms, coming and going. I also have migraines sometimes so I know the difference.