Okay mommies 1.) my milk supply was soooo good like a week ago and now when I pump I don’t get near as much as I used to…

Okay mommies 1.) my milk supply was soooo good like a week ago and now when I pump I don’t get near as much as I used to could this be because my baby eats from the boob more than the bottle? Or something else causing my milk supply to drop? And 2.) I never used got headaches this often and now after I had my first daughter I get a headache literally everyday. Any other mommies have this problem!?