WOW ~ I would have thought that MF would be okay to consume but listen to your body. Just like Joan said, you may want to do broth and crackers if that's what is working. I've never had a baby, but I can agree that my gall bladder attack was the worst thing I ever experienced. I genuinely thought I was having a massive heart attack and was dying.
Best of luck with surgery. You'll feel sooo much better afterwards.