You're taking a lot of steroids. 1000mg of Test is a lot and some of it will amoritize into estrogen. 500mg of Tren is also a good amount and you'll have an increase in prolactin. The combo of those gave me sensitive nipples too but I was only taking 500mg/wk of Test and 300mg/wk of Tren. I got on Arimadex right away and 25mcg every day for a couple of weeks cleared me up. Then I stayed on 25mcg eod until the end of my cycle.