The story about Chrisb1 not-so-good-second-long-fast is hoax. Misinformation. He is well and in good shape and advises WFasters elsewhere. See msgs above.
I truly believe, that one should closely follow their body signs in a WF. However, WF is uniquely and relatively contraindicated in pregnancy and breastfeeding (although in acute disease in these circumstances it is better than medications or other invasive or toxic means). in acute liver or renal failure and if one has like few hours to live. It had improved ppl on their death beds, literally.
You are doing great. What kind of water do you drink? Its quality may be affecting your stomach. Disilled is advisable. If not, it should be at least filtered and boiled.