Missed Periods

My last natural occurring period was in March. My next period was due at the beginning of April and never came. My husband and I thought I was pregnant and we tested but they were all negative. We had a blood test, ultrasound, pelvic exams, everything and the doctors told me that everything was normal. Nothing looked off and my levels were all fine. They gave me provera and I ended up getting a period in June from it. I decided to let my body reset and I still haven't had a period and today is cycle day 79. I have never missed a period until March. Now I'm just not having one. Has anybody else been through this?