I'm on Day 4 of my fast (again) and so far so good. I managed to stop the nausea, stomach pain, and vomiting of bile acid by taking Zantac, also known as ranitidine, to reduce gastric acid secretion. I actually feel great now and I think I can fast forever!
However, my face, neck, chest and back has broken out into hives. Because of the symmetrical pattern, meaning that I have pimples and hives on exactly the same sides of my face and body, I believe it to be hormonal in nature.
I'm aiming for a 10-Day fast. Hopefully all goes well.