so....if I didn't necessarily overdo it...going out, reading, computer tv, then is it just good days and bad days?

I'm trying to notice a pattern so I don't do the things that bring on the lightheadness and headaches, but sometimes even just staying home and a good night sleep...and I will wake up exhausted and then the headache comes on.

do you guys notice your symptoms come on right away?? or do you suffer the next day or two?