What is working for me is to weigh daily.
BUT...I don't worry about fluctuations at all. The only day I worry is my official day. I am not OCD. For me it's a routine. It's a fact of life. "Hey, those are numbers there. And hey I understand that my body may be dealing with some issues right now and it's up. Cool." If you are OCD, weigh once a week or month.
Since you said,
but most it is frustrating
I'd suggest that you should only weigh in once a month, every two weeks or once a week.