Breastfeeding issues: do you go to your ob/gyn?

Ignorant question, I know. But I believe I may have thrush of the breast, as my little one has signs of thrush himself and dear LORD my boob feels like hell. So, I have a doctor appointment for my son all nice and set; but who do I go to for me? I never really understood what doc is in charge of breasts and such, so is it your OBGYN?

Please help me cure my boobie pain lmao. Thank you awesome ladies in advance!