Hana,
For light exercise that isn't too taxing...just go for a walk. I, too, think it sounds like a bug. It's a lot of mind over matter too. If you constantly worry that something terribly wrong is up, you can induce the symptoms you're most worried about. And we all know fatigue goes along with stress.
One tylenol or one advil once in a while should be fine. They say it's worse to deal with pain than take one pain reliever...the dealing is more stressful which wreaks havoc on your body. What kind of enzymes are you taking? Probiotics might help more than an enzyme. Those little bacteria know their stuff!
There are a lot of AIH folks that complain of "liver pain". I have it and absolutely nothing has come of it and I have an abdominal US annually and I have had my gallbladder flow checked with a HIDA scan. Sometimes I think it's just gas pressing up in that direction.