When you fast, flow of bile through liver is minimal.
Bile flows when people consume fats or bitter foods. When fasting, bile flow is low.
Stagnant bile may have caused blockages on your intrahepatic bile ducts, impearing the liver and gallbladder function.
Once you start consuming fat again, there is not enough bile to digest it properely, causing all sorts of problems.
Bile is formed from cholesterol and from hormones.
When there is low bile flow, not enough cholesterol and not enough natural hormones are "washed out" from blood, causing acne, constipation, and may cause many different skin conditions + candida fungi in the gut.
It may also affect pancreas, causing pancreatitis or even diabetes.
And, all of it may have been triggered by a simple fast.