i went from being a 34D to a 34A in three years of running (also lost about 2 stone). so, i'm sure if you stick with it those 36DDs will begin to be less volumptuous (i'm sure i spelled that wrong!) although, that's not always the desired outcome of running! it has made it loads more comfortable for me.
also, i'm not sure if it would be worth it for you, but the pill has been great for me in getting rid of breast pain, cramps, etc. if you're not on it already, it might be worth a try.