Amidst all we know today, in modern medicine, it never ceases to amaze me the poor and uninformed advice doled-out by some physicians. I.E. The overwhelming majority of clinical data supports both cardiovascular and resistance training exercise, and their respective benefit(s) on liver function. That is, of course, barring excessive overtraining/over-reaching, substance use/abuse, and/or poor nutritional habits.
Therefore, I'd personally find it offensive if my physician recommended I stop exercising as the temporary 'cure' to what you've listed in your post.
Okay, that aside, b/c to learn your entire medical and lifestyle history/status would take far longer than either you could explain or my ADD could handle in this email format, here's a few helpful supplements that anyone especially concerned about their liver, as well as overall health should be taking:
-NAC (N-acetylcysteine): 600mg-4g per day, taken in divided doses w/ fat-containing meals.
-Taurine: 100mg-500mg, per Kg bodyweight, per day, taken in divided doses PRIOR to meals or carbohydrate loads.
-rALA (reduced Alpha Lipoic Acid): 300mg-600mg per day; consume on an empty stomach, in divided doses throughout the day (or, as a single bolus immediately post-workout, prior to carbohydrate re-loading). If taken in it's non-reduced form, combine w/ not less than 10mg NADH.
-Betaine (also referred to as TMG, or trimethylglycine): 600mg-6g per day; consume in divided doses, w/ protein-rich meals (one dose should be immediately post-workout w/ protein replenishment)
I've written a revised monograph on each of the aforementioned in an upcoming sports nutrition textbook for Humana Press, that was commissioned by the ISSN (International Society of Sports Nutrition); the book is set to go into print by the end of Q1 of this year if you'd like to learn the science behind why I made the aforementioned suggestions.
Hope this helps. - chris