Oh, that kind of job! That's not just a job, Mirjam, that's a much harder decision to make. You have said much that speaks for taking it, but you must not forget the other side: You do have a responsibility for the people in your immediate surroundings as well, and also a responsibility for yourself. This is a very hard decision, and whatever the outcome - everyone should respect it and noone has a right to call you a quitter - including yourself.
@topic: I feel tired but optimistic. This time of extra hours at work will end in a few weeks; until then I'll have two full weekends, and in March I'll do some vacation.
Cheers!
Markus