[anonymously]

It sounds like your dog may have a serious medical condition that needs to be properly diagnosed asap so that treatment may begin.
Delaying treatment may cause suffering and make whatever is going on worse.

This may be expensive, so, if you can’t afford to provide the medical care that your pet needs, I would talk to your vet, today, as to what your options are and how to proceed.
Best of luck.
PS: You may find some tips here https://www.aspca.org/about-us/faq/financial-help-my-vet-bills