What Causes Swollen Lymph Nodes Around Breasts And Lump In Stomach?

I am 42. I had a full abdominal hysterectomy at age 28. Over the past couple of months, I have been extremely tired regardless of the amount of sleep I am getting; and, noticed that my breasts are feeling heavy, and sore at times, particularly my left one. The lymph nodes between my armpit and left breast are swollen. A week ago I noticed a lump in my stomach left of my upper belly button, which is more prominent, though not protruding, when I stand up. There is discomfort but no real pain with the lump. it should be noted that I take testosterone and del estrogen in a monthly shot for hormone treatment. I am not on any other prescribed or OTC medications. I was adopted at 9, but know that my mother had ovarian cancer and my maternal grandmother had lung cancer. I do not know my birth father any family history on his side.