I have a Chihuahua and she seems to be sick what could be wrong?

Today she hasnt had a stool. She is sitting next to me and she acts as though a drunk person would. She will look at me holding her head up then she will start wobbling like she cant hold any more then she starts like falling asleep. She has done nothing but sleep all day.Shes never acted like this. Shes about 6 months old. and she wont respond to her name. But if someone comes in she gets excited for a min. then all over again does the same as above. Any help. I cnat take her to the vet now soo anything plz.