L.M.
Yes. I would also try to at least get some more fluids in him now. A day hear or there without eating much is ok but you have to keep fluid going especially since he was vomitting. More important than the not eating and vomitting is the fact that he is complaining, crying, and not acting himself.
I would call the doctor NOW, describe his symptoms and let him/her decide if he needs to be taken to the ER or seen in the am.