I've read some of your comments about your symptoms and experiences with headaches: I don't envy you.
I had a couple of minor surgeries and some were in full anastesia, some with spinal injection only. Once the nurse said that I may experience headaches and I thought, heck, I know a thing or two about headaches, but noone ever told me how fucking painful it is going to be.
It lasted for two days and the only good thing was that I did not vomit and had no tunnel vision, but the pain reached an astonishing level.