Thanks for your feedback everyone.
I am still experiencing pain. I'm not breastfeeding or anything, but I did just have my period. It ended yesterday. The pain is sort of constant, with waves of it being a bit stronger, and it's throughout my entire breast, sometimes almost into my arm. The redness is nearly gone - only a very, very faint pink. Still sound like mastitis or a blocked duct, correct? Not IBC?
I have another appt.