elastigirl,
Good for you.
I have fasted on and of for a long time but only a few days at a time and it wasn't a complete fast, I allowed myself water and fresh juice. I found the second day to be a bit hard. As for the headaches, they are the result of something you ate and are now doing without hence the headache. I gradually cut out most thing that I thought might be the cause of the headaches. Fasting became less uncomfortable.
You're brave watching movies. I couldn't and no adverts either. On my own I could do real good but seeing other people with food was torcher.