Ok, as a nurse, my first response is to slap your hand and say Don't be Daft Girl! If you need help, you press that Buzzer! It's what we're there for!!!!!. If it makes you feel better, explain to them at the beginning of the shift what your situation is (although they SHOULD already know).
Good in theory in a well-staffed ward, but for many of us the reality is you buzz and wait, and wait and wait. Those shifts change so often, it's hard to keep up with explaining your needs to everyone!