Tomorrow I test re cholesterol, sugar, iron, inflammation, liver, kidneys. Have Fibromyalgia & Bowel Disease. Alcohol affect if stopped 12 hrs. Prior?

Unlikely. Though if an alcoholic that may alter your liver function.
Long list. The conditions you have - plus any additional ones - argue for minimal and very infrequent (if any) alcohol anyway. It is not a situation like an employment drug test where you want to pass. Here you want to discover and treat disorders. I'm almost certain that your bowel will be much happier and maybe fibro too. Don't be afraid to discuss it honestly w/ a Dr - they're here to serve you, not judge.