hey dude,
First of all you have to go see a doctor. Unfortunately with Gyno if it gets quite sever then its most likely you may hvae to have surgery to get removed. However this is up to you, you can live with it if it isnt really bad.
Estrogen blockers ie. nolva etc don't really help that much with these kind of situations, you need something more hardcore like letrozole/femara which is an anti-aromitose.
If you use the search function on this you might find a couple of threads about people attempting to use letro as a treatment to reverse gyno. I havn't thoroughly read these so I'm not sure of the findings.
Either way go consult your GP, they know alot but also speak to some of the vets on here sometimes they might know a little more than your GP due to personal experience.
Good luck and dont stress too much
As a buddhist once told me:
Whatever it is thats worrying you... If theres something you can do about it.. then theres no need to worry!
and if there is nothing you can do about it..... then there is also no need to worry!
see a doc and chin up ;-)