Gynocomastia = Excessive growth of mammary glands caused by high levels of estrogen.
Hyperprolactinemia = High levels of prolactin in blood causing milky discharge from nipples.
Gyno is caused by estrogen, some people think progestrin activity can cause gyno but it all boils down to estrogen.. Tren has been known to cause gyno, stay on the ATD until your symptoms reside- get yourself some Nolva, and run it as well.
Never abruptly stop ATD b/c it is VERY estrogen suppressive- and stopping it cold turkey can cause a rebound of estrogen and reaggrevate your gyno. Taper the doses down, like 3 pills until symptoms reside, then 2 for another week, then 1 for the last week etc..