A) Fasting usually stops periods. Your body stops unnecessary functions for survival like procreation.
B) In theory it helps with PCOD, and should not cause it. You are prone to it and that’s a problem you’ll be addressing. Physicians tend to throw you on a hormonal birth control and hope it works. I’m sorry you have to suffer with it, I’ve had partners with it and genuinely have empathy.
C) You don’t have to just trust me, but I used to be a nurse and am a fasting nerd. The anecdotal evidence and scientific evidence is out there for what I’m saying.
D) I’m not sure why you were concerned you stopped getting your period. It doesn’t hurt anything, it is O K. Extreme athletes tend to stop getting them as well, due to the “stress” on their bodies. All kinds of reasons the body adapts.
Best of luck.