I don't know what "Tren Extreme" is, but if it is supposed to be like Trenbolone Acetate it cannot aromatize. This means one of 3 things.
1.) This "Tren Extreme" is not actually mimicing Tren in which case I don't know what it is or what your possible gyno is being caused by.
2.) If it is like Trenbolone Acetate then your possible gyno is being cause by progestin not estrogen and neither nolvadex or anastrozole/letrozole will combat this. Winstrol is the most readily available progestin antagonist, but it is also a 17-AA so you should stop taking any other 17-AA orals including whatever this Tren is. The best progestin antagonist is RU486 (mifepristone) but good luck finding any, especially if you are in the US. It is essentially a morning after pill that is used primarily in Europe.
3.) Your suspected gyno is something else.
Safe bet, stop taking the Tren get some nolva and run at 20-60mg ED get ahold of some winny if it doesn't stop and run that at 25mg ED if the nolva doesn't do anything within 3 days. Do you have a nodule formed or just a buildup of loose adipose tissue (fat)?