Is there anything that could have reduced the effectivness of your last antibiotics?
Think Emma has given you some really great advice
The only thing I can think to add is that sometimes hand expressing after a feed can help to ensure the ducts are clear, however if you are feeding every few hours then you should be able to avoid this by feeding off the same side as suggested. Expression may also be good if you find that your breast is becoming full and the baby doesnt need to feed at that time - use heat and gentle massage to help.
Also you mentioned you had spoken to a breast feeding councilor - could they help verify your positioning just in case they can suggest anything to help.
You probably already have thought of this but just wanted to share incase