Hi - I'm sorry for this challenge you're going through. There may be a tumor in your breast that's hidden enough that the mammogram didn't pick it up. Or, as they say, it could be lymphoma. Breast cancer is usually pretty symptom-less; you don't feel tired or sick, you just suddenly discover a lump, either by feeling it, or via mammogram or MRI. I'm not a doctor and can't hazard a guess what those masses might be. I'd say at this point, all you can do is wait for the next test. Best of luck to you- PJH