Sorry to hear he's feeling down again. Yes, keep the appointment, hear the vet out...see what his thoughts are. Get copies for yourself, of ALL the test run so far. Exactly what part of the liver function was abnormal...it could still be pancreatitis. Poor baby...poor you, I'm sorry this is happening, I do hope you come to a conclusion, and that whatever it may be is treatable and has no long lasting effects.
Theo has my thoughts and prayers...I wish him well!!!
__________________ As Ever, Kathy 
Intruducing Bentley  Winston and Spencer: RIP My Sweet Angels |