First time it happened when I was ~15 and had to stay in hospital for a week or so until they figured out what was happening.
For me physical over-exhaustion, too much spicy food or too much alcohol can / could trigger this.
Gilbert syndrome doesn't affect any liver function tests aside from unconjugated bilirubin - a value that reflects a backup of bilirubin processing, and not a liver-damaging process.
The maximum level of GPT touched the 27 Units/L (now 9.5), when the maximum value allowed is 0.75 and the bilirubin skyrocketed as well, now at 70 (vs. 25). GOP stays around 3.5 U/L (max allowed: < 1)
My only drug that I cannot refuse are sweets. Chocolate above all, so i take my daily dose of sweet.
Alcohol is approximately ~0.5L of beer on Saturdays, when going out to eat, sometimes a glass or two of wine. At home I don't drink alcohol, only when at big occasions such as Easter and Xmas.
What I suspect is food poisoning by eating somewhere outside: hypothesis backed by the fact that my wife and my son weren't contaminated at home, so the fresh food @ home was always safe.
Became suddenly yellow, done the liver-biopsy, nothing came out and still with high liver values (GPT, GOT). None of doctors have a fucking idea of what I have. Done all tests against all the kind of Hepatitis, but all of them were negative.