Why won't my boobs stop growing?

I am almost 29 and my youngest is 4. I am 245 pounds but look 175. I went from a 40DDD and resized in 11 months cause my bras are ripping apart from being to small. I am losing weight and they are sore. They just keep getting bigger. I am a 40F when sized 3 months ago. I am afraid to go in and get sized to get bigger bras when I have the money. Anyone know when or if they will get smaller? I have had a hysterectomy in 2009 and have my ovaries, they took everything else.