How are you doing?

Everyone keeps asking me how I'm doing, and I know that they all mean well, but it's such a silly question. I mean do people want the real answer...I'm just kinda numb, and sometimes I forget about it, but then I remember and cry again? Am I supposed to say that I'm doing ok? (Which would be really weird given the circumstances.) I know people don't know what to say, and that they really do care, and they mean well. I just didn't realize how many times people say that, myself included. And now I wonder how many times people just say they're fine even when they are not, because that is the standard answer to the question.
PS: Right now, for me, the answer would be, I'm hanging in there. Getting done what needs to be done, trying to be there for my mom, planning the service, and some moments are better than others.