It sounds like your vet(s) are on the right track. His liver is a major concern. The next step would be ultrasound and/or scintography to look for a shunt. It really couldn't have been ruled out yet.
Liver problems could cause a diarrhea issue as could so many other things. Will he eat canned food? Pickiness can be a symptom of liver problems. He may just not feel well after eating.
When the liver isn't functioning properly (and it isn't if the bile acids were elevated), toxins can build up in the body because they aren't being filtered properly. This causes hepatic encephalopathy (seizures, shaking, circling, head pressing, walking into walls, etc.).
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