R..
1~I pumped when I was engorged at night... If I thought she would wake up hungry in a short while I would only pump enough to make myself comfortable.
2~sorry, I can't help you there... I was never comfortable nursing in public, so I usually either pumped and fed her a bottle, or would sit in the car with a blanket over the window.
3~My DD lost her appetite for about 3 days every time she got vaccinated... I would keep an eye on her today, let it go if she's back to normal, call the pediatrician if not... just to be safe. :)