Someone should make a sticky with info on prolactin / bromo, etc.
Nandrolones like deca, tren, etc raise prolactin which in turn will raise progesterone. You have that to thank for the deca dick... some are more sensitive than others to it, but its the elevated prolactin that cause a shift in unwanted hormones to cause libido issues, gyno in some, and longer more difficult recovery.
It is best to inhibit prolactin FROM THE START (not when you're having symptoms) by using something like dostinex/cabaser .5mg twice a week throughout your cycle is enough to keep you good to go.