Hi Abbs, welcome to Sjogren's World.
Autoimmune hepatitis really complicates your treatment options, because so many of the current treatments can have an adverse effect on the liver, as you've already seen. Plaquenil is one of the safer drugs, as far as LFTs (liver function tests) are concerned, so youprobably won't want to try any of the others like Methotrexate, that starts out with warnings about the liver. Liver problems can even cause issues with "natural" supplements, like fish oils and capsules, which some people have found very helpful. With AH, you will always have to consult with the doctor who treats you (gastroenterologist perhaps?) before trying any drug, alternative or supplement.
We are building a large group of members in the UK, and maybe some of them might be able to suggest a new rheumy or hospital that might not be as "off hand", although your rheumy's plan (if not his manner) seemed to indicate that he at least was prepared to treat.
Please, read as much as you can, and enjoy it...you're right, this is a great place for information, but also for support and entertainment.
Among our 4 weekly chats, there's one at 7PM GMT Wednesday, which we tend to call our Euro chat (although everyone is welcome) because it's the most accessable time for the UK and Europe. The link is at the bottom of my post. Please try to drop in, it's a lovely visit with fun people who understand.