Have you ever had your prolactin taken to see if it's elevated? I don't know how a whole lot about it, but I know that it can cause issues if it's elevated. Mine got elevated really fast once and they said it can indicate a pituitary tumor so I got it retested later and it had gone down so they didn't supect that anymore. High cortisol can also indicate a pituitary tumor from what they told me (but I don't know how high the level has to be before they suspect it). My cortisol was low so they were no longer suspecting an issue with the pituitary because of that. I don't mean this to scare you, but just something to ask about as your level is elevated/high. Or mybe they could check your prolactin. If you got prolactin tested and it was high, that might provide you with some clues.
I really don't understand it all, but I did find info in this article online that kind of goes into it...the part talking about prolactinoma talks about it a little.
Maybe you have already looked into this, but I thought worth mentioning since it was brought up with me once. I don't have POF, but it doesn't always cause POF (at least I don't think it does).
I hope you can find some answers soon