@marehare Sadly, lavender is also a headache and migraine trigger for many... my daughter, my sister-in-law, and several on this forum.
And although FOs do tend to give me headaches more than EOs, many EOs also give me bad headaches. Too much of any scent in general will give me a headache, actually.
Some EOs are known to trigger seizures. Per the epilepsy society, "Rosemary, fennel, sage, eucalyptus, hyssop, wormwood, camphor and spike lavender are not recommended as essential oils if you have epilepsy."
Other EOs are known skin sensitizers (clove, cinnamon, nutmeg, anise) or photosensitizers (any of the citrus EOs). Most EOs are also highly processed themselves; as one of the other forum members noted, they don't just drip out of the plant into the bottles.
So while I generally do prefer EOs, I can't make the blanket statement that EOs fix headaches, while FOs cause them. For me and for many others, that just isn't so.