gag/heaves/nausea after CABG

My 69 y/o husband underwent CABG x3 with mitral valve repair 01/08/08 and in the following 5 weeks has lost 40 pounds from not being able to eat/drink without instantly heaving. It is better controlled now with reglan and we inserted a picc line for TPN which was started Tuesday. Labs are WNL except for alk. phos on last admission (last Fri through Tuesday) at 196 (then down to 185, then 165--drew another today) GI thinks may have be d/t dehydration but fractionated level indicates liver so we are sched for CT abd to r/o malignancy. NO jaundice, abd pain... EGD neg, stool for culture and C. Diff neg too. This am tolerated a GLASSFUL of crushed ice, yet now had instant heaves after one small spoon of orange jello (he said tasted TOOOOO strongly of orange--taste perversion.) has NEVER vomitted, only heaves. Coumadin was stopped last Sat as all of his S & S are SE of coumadin. We have GI and cardio on case and my husband is family practice himself, --no idea who else to consult...?neuro??
Any thoughts or ideas would be greatly appreciated
Thanks
Mary Jean