[My Nacho]

I got my sweet little nacho on 2/14/09, he is now 9months. day before yesterday he started dragging his behind. but only did it for a couple hours. was fine the rest of the night and the next day. this morning i woke up to gagging and hacking thought he must have just gotten in to something(he will eat anything as long as it doesn't run to fast). normally he is okay with the crayons, sidewalk chalk, potpurri, foil...ect... that he eats. normally i do my morning thing before work and he is right there, well i called and called for him and found him hiding(normally only does that when he did something naughty), and also noticed he had gotten sick from both ends all over the bed. got home from work and he has just been lying around, sleeping most the day. i cant get him to eat or drink anything. i thought i would ask the yorkie experienced first before i pay an arm and a leg at the vet. please help!!!! any advise would be appriciated!