Best thing I can say is that you should calm down!
I've been where you are now. About 12 months back I went to see a doctor after several weeks of tummy upsets and URQ pain. After several scans they located some deposits on my liver which later turned out to be fatty deposits.
I was tested for all strains of Hepatitus as my liver was inflamed, but at the end of the day it was merely fatty liver, non alcoholic that was the cause.
The good news my doctors told me was that they can tell pretty easily from just a CAT scan the difference between a simple tumor/fatty deposit and something more. So if they're already seen it and not drawn a conclusion down that path, you're gonna be okay.
I went through the same line of questioning you did too. I've only had one partner for the last decade, no blood transfusions etc. I was cleared for all strains of Hep A through D although I was told by my doc that there are strains beyond that which simple blood tests don't detect - and the most common way of getting that is through contaminated food!
Needless to say I very rarely (if ever) eat out now as a result.
But the good news is, both my fatty liver and my Hep are in remission and I'm doing well.
It's scary as hell and for months there on end I went through hell as my liver struggled, but rest assured, you'll be okay in the end.
The most important thing you can do is stay calm and positive and make sure you're in regular contact with your doctors for what the latest news is. I went through many tests myself (Endoscopy, Bloodwork, Xrays, Cat Scans (tummy, cholangeogram and head ct) - you name it - and I was constantly afraid through the whole thing. It's only natural to feel that way and you'll constantly search for that reassurance. It took my doctors basically 3 months to clear me of everything else before concluding it was just basically a really bad case of fatty liver causing my problems, which kinda sucks when you're a person that doesn't drink and is in a stable relationship. It was just a lack of exercise and a crap diet for years...
But if it's of any consequence, if you had something serious, they almost always pick it up real quick when it comes to liver. Just take things as they come...