It turns out, that some of my headache is caffeine withdrawal. My SIL likes really strong coffee. I probably drank 1-2 cups more /day than usual at double strength. Today I slept in and woke up with the headache. I had my first cup of coffee at 10:30 am. That first cup took the edge off, so I am currently having # 2. I haven't eaten yet. Nauseous.