So sorry you've got it - what a pain!
I had it twice with ds2. By the time I made it to the appointment it was past the point where I felt comfortable with natural remedies, so I went straight for the antibiotics. I had a red rash, fever, and fainting. It was pretty exciting - not in a fun way though.
I wouldn't worry so much about this practitioner's view of EBF, as you said, you haven't seen them before and may not see them again. You are there for help with a specific problem - an infection - not for their opinion on EBF.
I hope it goes well and that you feel better soon.
Best of Luck!!