Mai mai neurologist fees

I came home to find maimai in the corner of my bed frozen scared with vomit and pee on the bed and she couldn’t stand, I rushed her to the vet and and they ran blood tests, found nothing wrong and couldn’t explain her behavior, she’s falling over nodding out and cries hysterically when she isn’t being held, the vet says she needs to go to a neurologist for brain scans and other over night tests, they told us it would cost $900+ We can’t afford this and any help is appreciated