Mathman, welcome to the forum. It's good that you are taking your health seriously. What we do or don't do when young, and over the years, can affect our later health. If you want to be absolutely sure there is nothing going on with your kidneys or liver, see a nephrologist (kidney specialist) and/or a hepatologist (liver specialist) for more specific testing. I know you said you cannot afford more testing, but you can try the clinics at a teaching hospital. They charge on a sliding scale, according to income, and their services are often free. Otherwise, just continue with your lifestyle changes and be as good to your body as possible. I would advise against drinking on a regular basis, also, if at all.
All the best to you!
Forum moderator - Hepatitis
"But that was yesterday, and I was a different person then."
Lewis Carroll, Alice in Wonderland