If you have AIH and ammonia build-up, you should be avoiding all protein, and you will be prescribed Lactulose or a similar drug to rid your body of ammonia. The ammonia isn't "in your brain", but it will cause brain dysfunction, confusion. It is essential for people with liver-related ammonia build-up to remove all protein. If this truly is your problem, your doctor should be explaining this. Please discuss this with him or her.
Are you taking Imuran or something similar along with Prednisone? If not, why not? Imuran (azathioprine) will allow you to take a lower dose of Prednisone; it's known as a "steroid-sparing" drug.
Unfortunately, diet and exercise won't take care of AIH. They're good adjuncts, improving your over-all health, but only medications will keep your AIH under control. I say "heal" because AIH is a life-long disorder; it never goes away. However, it can be managed.
Mine was diagnosed eight years ago. I was in extremely bad shape, but now I'm doing well.
Best wishes.
What kind of test did they do on you to make you think you have ammonia build up in brain? Oh, never mind, I think I know, do you sometimes have little kind of go off sessions where things aren't really there? I know someone who went thru that is why I say that.
Everything back down to normal as far as your numbers now since you went back on the medicines? Hope so, stay in touch. Jody