Since you had an exudate and some redness it seemed likely it is an infection. I read the information about mastitis at http://www.mayoclinic.com.
According to that information you may have had some mastitis when you were breast feeding and thought it was normal, just irritation so was not treated. Once a person has had an initial infection it tends to reoccur, so this might be what is happening. Mayo Clinic would advise Antibiotic treatment to clear up the infection. It coud be that the treatments you are doing lowered your immunity and allowed the bacteria that were hiding in there to grow resulting in the synptoms.