I had a Gastric Sleeve 5/7/16 and have been unable to hold any fluids or food down since; any clue to what it could be?

I have had EGD(normal), Gastric dumping test(Normal),Head CT(normal) Blood work(normal), Tried ABT(didn't work), tried Reglan, Omeprazole(nothing), I cant keep anything in even water... I am on TPN now to keep me going and my Doc is stumped he said he has no clue why I can eat or drink and I am starving. I can only eat one or two bite of food and fight to keep in with Zofran and Phenergan...sometimes I win most time I don't

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