A noteworthy thing about her headache is it always comes with a sound effect “ズキ”.
In addition to the scenes above, there are also a few occasions when the sound appears, despite no headache:
When her childhood memories surfaced after she saved the little girl
When she witnessed the Female Titan eating Eren
Seems like her headache always happens when she is in fear of a losing a family…? The only exception is when her childhood memories are triggered by that little girl…?
midnight-in-town 