Bloody non-spontaneous discharge—imaging tomorrow

6 days ago on my 45th birthday (Friday, aug 10) I woke up after sleeping on my stomach with very sharp constant nipple and areola pain on my right breast. I pressed the nipple and a long strand of thick whiteish/ yellowish discharge came out of one duct on my nipple then ended up with loose pus-like fluid after that all came out. It was slightly tinged with blood. Next to that, a tiny bead of bright red blood came out of a separate Duct. I immediately called my doctor who got me in for an prelim exam on Monday. She felt no obvious lumps or swollen lymphnodes. She ordered diagnostic mammogram which is tomorrow. I still have pain in nipple and areola but not as strong as that morning. The Montgomery glands are extremely painful to the touch as Is the tip of my nipple. There is a lot of pain in the area under my areola and feels more lumpy than usual. Rest of the breast is very tender. I have extremely large breasts that are very dense (I have 40i cups) and was diagnosed with a benign fibroadenoma in nov 2015 on the other breast. I have no other skin changes in that breast with the current pain except for one pimple-like dot that is red. No itchiness, redness, just extremely painful areola skin and the Montgomery gland pain. No fever. I have had no discharge spontaneous or otherwise since last Friday.

I'm of course so incredibly anxious worried about IBC or any other kind of malignancy. Could this be an infection? My whole breast is painful but not red. I started my period 4 days ago but the hormonal tenderness is usually gone by the 1st or 2nd day.

What questions should I ask at the breast center tomorrow? Should I make sure they do US?

Thank you! Freaking.