stress. I use to have pain migraines, now they are silent. I lose vision - in spots and I feel woozie. Then after its over, the ouch comes.
My sister is hyper sensitive to odors. Happened after she had a total hysterectomy. She can even detect my shampoo! I have to shower and put my clothes out the day before I see her. If she just shows up.... its going to be a headache unless I stay upwind of her. Its hard.