Stress????

Looking for some advice, comments, ect. I have been off of nuvaring since October 2015 and was having regular periods up until February, which was my last. I have taken numerous tests one blood test. All which have come back negative. Since last year I have been going through court with a pretty serious case that occurred through my childhood. So I am unsure if stress if causing the missed periods or if I should keep testing my self.