Gyno with hgh

I am taking hgh 3 iu(5 days in a week) with my cycle of tren-a 100 mg , teat propionate 100 mg.
I am taking arimidex 1 mg every day. But still i am developing gyno.
Then i start bromicriptine to suppress prolactin levels and it works.
My concern is who is enhancing my prolactine levels.