There is a lot of controversy relating zinc to androgen hormones. I've basically seen all sorts of Zn-androgens combinations in the studies. Apperantly, your T levels and thyroide hormones levels also plays role how your body will react to zn... also you have to guess the right dose of Zn. 30mg is not very extreme dose, but I've read people have odd reactions from 40 or 50 mgs.
I suggest you take a break from Zn, do some research and try to adjust your dose.