ewt | GOP! Poor ewt.

I've had a headache since sometime yesterday afternoon. It abated a bit in the evening but this morning it is back full force. I'm not hungry or dehydrated, I didn't get particularly less sleep than normal, I don't feel otherwise ill, and I don't think I hit my head on anything. It doesn't feel like referred pain from muscle tension elsewhere. I've had 500mg paracetamol (which is like acetaminophen) but the headache persists. Any ideas? I am unaccustomed to random headaches and could do without this one.

Horn lesson was good. I have a hell of a lot of work to do, though. Also, random headaches during horn lesson = bad.