I hope that you and the docs can get this figured out soon and can relive his pain/discomfort. It's bad enough to be sick, but when pain is added in, it can be miserable!
If it's his liver, you might want to check into milk thistle to help protect it. It's helped a lot of members on this forum! The only caution I have ever seen for milk thistle is if the person is allergic to ragweed, they may not tolerate the milk thistle well. I know that I have a ragweed allergy and can't tolerate milk thistle at all -so be cautious if you choose to try it.
I love that site!! Kind of like a new toy sometimes!
I had doctors telling me that there were organs in my abdomen ('Doh!) and wouldn't answer other questions, so I found that site to help even my poor infected brain to figure out what was hurting!!