My doctor told me that if certain side effects arise we will have to make sure that it is not a tumor of the pituitary gland.
That is to say, in my case too high Prolactin levels most likely have nothing to do with the pituitary gland tumor but with the need for HRT fine tuning, but to just be cautious the pituitary gland tumor shall be checked to be excluded as a possibility.
Another gal here had similar issues and her doc just adjusted her HRT. She is just fine now without any tumor on her pituitary gland!
It is understandably scary situation but like I said, it is most likely nothing other than the HRT issue that can be easily fixed.
Hang in there!