I decided to follow the tip "Take a hot shower ". Unfortunately the geyser broke at that time and there was only cold water from the tap. Still, I filled the bottom of the tub with cold water and lavender-scented soap. I sit with my feet in the cold water and I ate a small bowl of chips for salinity, already the headache was dropped after 10 minutes so I could relax and lie down in bed. So, maybe a tip for anyone who has really tried everything ! For me it works , and I hope someone can help.