What is causing nipple discharge and breast enlargement?

[LadyMamaLady]

I have had nipple discharge for over a year. It has never bothered me much, although now the amount which used to be just pin sized drops and clear, increases daily and is both clear and solid white depending on which duct it comes out of. My breasts have also become a lot larger following weight gain of 30+ lbs (this was necessary for my health as I am 5'6" and only weighed 90 lbs due to stress in an abusive relationship, was never hungry and never could keep a lot of food down; ended the relationship and almost immediately appetite returned and I started gaining weight and I'm now 120-125 lbs) The little bumps around the areola that are considered normal have gotten a lot bigger and sometimes my nipples sink downward like half of them are flattening into my breast, they return to normal after squeezing the discharge out. My breasts (more on right side where I had a lumpectomy to remove a large painful mass that was causing my right breast to be almost a cup size larger than my left which used to be the larger breast in 2009, age 21, 6 months after giving birth to my child) now feel heavy, pained and "swollen" like when I used to get periods. I no longer have a period because I have a mirena intrauterine device as birth control. My last extremely light and short period was in April of 2015. I also have pain in my neck that never seems to go away although it is not extremely bothersome, I cannot crack my neck anymore which used to be done by a physical therapist. I was born with a concave chest and had a pectis excavatum repair when I was just 4, then a surgery to remove part of my sternum that was deformed in 2011, and the removal of ribs 7 & 8 (left side) that were deformed and growing cartlidge that I was told was going to eventually pierce into my heart and the ribs were replaced with a single titanium rod, I cannot have an MRI due to this being in place. I am curious as to what could be causing this and if any of this sounds normal? I recently had a head injury and a CT Scan without contrast which was read as normal in the ER. Thank you for any information you may have.