My 3 1/2 month old went over 12 hours without eating last night. When we got up this morning, my breasts were engorged and sore, but after feeding her and expressing, the pain on one side never subsided.I continued to feed her on that side today, more than the other. I used a heating pad for the pain and took ibuprofen, but it continues and worsens. Now the area over my nipple is red, and I'm starting to feel nauseated and exhausted. What should I do?