Hi MD -
I'm also one of the self diagnosed worried person here until i've been officially told to stop self diagnosing all together.
LFT and ultrasound should be your first steps and you can follow your doctors recommendations from there. I know.. everytime i feel super tired and i look up the cause online.. it starts with liver cancer to cirrohsis to ... just doesn't stop. but it's natural to get tired at busy work place.
I quit smoking 2 years ago cold turkey, I cut down drinking and been dry for few month ago... I worry so much that I have panic attack and when I think about this... it's easy to let go of the addictions.. atleast for me. it's not easy but at some point... it'll happen if you keep trying. GL.