It sounds as if your dog is in a lot of pain could she have been injured in anyway.Gently feel for a sore spot again.It could be so many things, is she limping ??and as Linda asked how old is she.
Please reply as we would like to help.
I know you don"t like to answer, but if u can't provide financially for a pet you should not have one. REALLY loving an animal is to do what is best for them and not being able to go to the vet does not fit into this. however, it could be an internal problem, such as a urinary tract infection, or arthritis. If you really care for him, get him to the vet or else give him to someone who really cares!