Provera and breast pain/cysts....

My Dr. has prescribed me 10mg of provera to take for 10 days every month to help with spotting,irregular cycles, and a host of other symptoms! I am concerned it will make my cysts and breast pain much worse, and am scared to take it. She said it shouldn't have any effect on my breast issues. Anyone ever taken this and how did it make you feel? Did it make you breast pain, and cysts worse after taking? Thanks!