I am worried sick about my dog?

shes a staff female 9 months and the last 5 days she hasnt been eating well everytime shes next to me she wants to sleep but if i take her out shes normal ive been giving her human food (boiled chicken or minced beef) because i never had money but know i got her lots of puppy food like cesars butchers and aplaws she dosent eat very well but she eats the cesars i usualy give her 2 trays but now she eats 1 tray through out the hole she hasnt eaten nothing im not sure if its lung worms or parvo virus and todays bank holiday and i tried phoning the rspca emergency but they dont answer then there line is busy i dont the address of it please i need help what could i do i dont have money to go to a normal vet