I would use Nolvadex for any Gyno, or Sensitive problems. You need a SERM, not an AI.. Arimidex is great for 'estrogen' control.. Nolva acts on the breast receptor.. And @ 20mg per day 10-14 days, it should do the trick. And your Doc is going the have no clue why your breast are sensitive (if you really are), you know how many people in this world have natural gyno problems.. And he's your Doc, he works for you, you ask the questions, or you can get another Doctor..
Kenny , Tren doesn't convert into to estrogen , so it's basically your Test E is what matters here. You could have a prolactin problem from the Tren E , but I would have to know your dosing and how long you been 'on' cycle. But I think your probably fine, If your 500mg test e per wk, or more, I would start thinkin about your E2 and a AI. It just common sense my friend...GhostProfit